I have an energy blaster myself, and I like it a lot, comparing to my tank who has a lot more rigid build. (ie. not much chance to change the order of powers).
I'd take build-up earlier, maybe swap energy punch with build-up.
Nice, thanks.
Hey Chi,
Ignore power bolt, it's wanky!
Edit: you really need to sort out your slotting too. Get energy punch, bone smasher, power blast and power burst 6 slotted. Those are the only attacks you really need. Don't bother with explosive blast, that's poor too. If you really want an AoE attack get energy torrent, but I'd personally forget that too. Maybe later today I'll post my blapper build up for you 
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
Heh, thanks. But I haven't made him yet!
Would just like to offer a handful of suggestions, just because I seem to spend more time on planning heroes than playing them these days 
First, I'd suggest leaving Conserve Power until 22 so that you can get Stamina at 20 - by no means a necessary change, but Conserve Power has such a long recharge that Stamina is the more useful power. That said, I certainly wouldn't dump Conserve Power entirely because it is a great power, especially when facing AVs for instance, when you just want to be laying into him with everything you've got
I'd suggest getting Buildup and Aim as early as possible really - they're great powers and they come back quicker than you might think. With both of them you can pretty much just alternate from one fight to the next.
I've never been a big fan of snipes - I certainly haven't missed having one on my ice/energy blaster. As a blapper, you'd likely get more utility out of Stun, which should work nicely for disorienting one minion/lieutenant while you take out his buddies. With Boost Power doubling the duration as well, it can be used to great effect, removing a particularly threatening mob from the fight. Power Push can also be useful for the same reason - I gather you can quite easily keep an enemy permanently on his back, just knock him into a corner and keep him there.
Anyway, below is a build based on my thoughts above - I've omitted the whole colour thing, because it offends my eyes It's very much a single target attack oriented build. I suppose one AoE might be nice - I gather Energy Torrent is generally preferred over Explosive Blast.
01) --> Power Blast==> Acc(1) Acc(3) Dmg(5) Dmg(13) Dmg(17) Rechg(36)
01) --> Power Thrust==> Acc(1) Acc(37)
02) --> Energy Punch==> Acc(2) Acc(3) Dmg(5) Dmg(9) Dmg(15) Rechg(19)
04) --> Build Up==> Rechg(4) Rechg(25) Rechg(31)
06) --> Power Burst==> Acc(6) Acc(7) Dmg(7) Dmg(9) Dmg(17) Rechg(37)
08) --> Hasten==> Rechg(8) Rechg(23) Rechg(23)
10) --> Bone Smasher==> Acc(10) Acc(11) Dmg(11) Dmg(13) Dmg(15) Rechg(19)
12) --> Aim==> Rechg(12) Rechg(25) Rechg(31)
14) --> Super Speed==> EndRdx(14)
16) --> Hurdle==> Jump(16) Jump(36) Jump(43)
18) --> Health==> Heal(18) Heal(40) Heal(43)
20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> Conserve Power==> Rechg(22) Rechg(29) Rechg(31)
24) --> Stealth==> EndRdx(24) EndRdx(46)
26) --> Stun==> Acc(26) Acc(27) DisDur(27) Rechg(36) Rechg(46)
28) --> Power Boost==> Rechg(28) Rechg(29) Rechg(34)
30) --> Power Push==> Acc(30) Rechg(37)
32) --> Nova==> Acc(32) Acc(33) Dmg(33) Dmg(33) Dmg(34) Rechg(34)
35) --> Boost Range==> Rechg(35) Rechg(43)
38) --> Total Focus==> Acc(38) Acc(39) Dmg(39) Dmg(39) Dmg(40) Rechg(40)
41) --> Personal Force Field==> DefBuf(41) DefBuf(42) DefBuf(42) Rechg(42)
44) --> Temp Invulnerability==> EndRdx(44) EndRdx(45) DmgRes(45) DmgRes(45) DmgRes(46)
47) --> Force of Nature==> DmgRes(47) DmgRes(48) DmgRes(48) Rechg(48) Rechg(50) Rechg(50)
49) --> Combat Jumping==> Jump(49) Jump(50)
Whatever you end up with, good luck and enjoy 
EDIT: Given further thought, the medicine pool is well worth considering, certainly later on when you can use Aid Self while in your Personal Force Field. Of course squeezing it in is the hard part!
@Hakeswell
Union Ilservian, Evinlea
Defiant Expeditor, Hakeswell
Arc: 70119 Hellion Initiation
Here ya go Chi, this is something like my build at the moment (although I'm only at 1 at the mo)
The philosophy is that I want to deliver a colossal amount of single target damage in a short time, and nothing else. Snipe is in there cos I saw someone do an insane divebomb to get defiance up high then sniping 
Lots of slots thrown at my maneuverbility for PvP, and helps a bit in PvE too
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Exported from Ver: 1.7.5.0 of the CoH_CoV Character Builder - (http://home.comcast.net/~SherkSilver/index.html)
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Name:
Level: 41
Archetype: Blaster
Primary: Energy Blast
Secondary: Energy Manipulation
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01) --> Power Blast==> Acc(1) Acc(3) Dmg(3) Dmg(15) Dmg(23) EndRdx(37)
01) --> Power Thrust==> Acc(1)
02) --> Energy Punch==> Acc(2) Acc(7) Dmg(9) Dmg(13) Dmg(23) EndRdx(37)
04) --> Build Up==> Rechg(4) Rechg(5) Rechg(5)
06) --> Power Burst==> Acc(6) Acc(7) Dmg(9) Dmg(15) Dmg(19) Rechg(37)
08) --> Swift==> Run(8) Run(40) Run(40)
10) --> Bone Smasher==> Acc(10) Acc(11) Dmg(11) Dmg(13) Dmg(19) Rechg(36)
12) --> Combat Jumping==> Jump(12) Jump(31)
14) --> Super Jump==> Jump(14)
16) --> Aim==> Rechg(16) Rechg(17) Rechg(17)
18) --> Hurdle==> Jump(18) Jump(27) Jump(27)
20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> Acrobatics==> EndRdx(22)
24) --> Hasten==> Rechg(24) Rechg(25) Rechg(25)
26) --> Super Speed==> EndRdx(26)
28) --> Sniper Blast==> Acc(28) Dmg(29) Dmg(29) Dmg(31)
30) --> Conserve Power==> Rechg(30) Rechg(31) Rechg(34)
32) --> Nova==> Acc(32) Dmg(33) Dmg(33) Dmg(33) Rechg(34) Rechg(34)
35) --> Power Boost==> Rechg(35) Rechg(36) Rechg(36)
38) --> Total Focus==> Acc(38) Acc(39) Dmg(39) Dmg(39) Dmg(40)
---------------------------------------------
01) --> Sprint==> Empty(1)
01) --> Brawl==> Empty(1)
01) --> Defiance==> Empty(1)
02) --> Rest==> Empty(2)
---------------------------------------------
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
Looks nice Irra, just put 1 more acc in power thrust, the knockback can really help against bosses and stuff. +for PvP after you toggle knock you have take alot of damage against scraps or other blappers(they normally have a tendency to hit back) so 1 good power thrust sends them flying and gives you time to get off a couple of uber defiance powered attacks.
50s
controllers: Ill rad , grav rad, fire kin, ice kin
blaster: ice em
scrapper: spines sr
Right-e-oh then. I have just downloaded Hero Builder, and tried it out on this Blaster I recently started. Here's what I'm planning.
I'd like you to take into account that some powers are 4 slotted with the same thing (didn't realise I was doing it, then couldn't be bothered to change it), and that hasten is 2 slotted until around lvl 30 lol. This would be different in practice.
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Exported from Ver: 1.7.6.0 of the CoH_CoV Character Builder
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Name: Chi Seeker
Level: 50
Archetype: Blaster
Primary: Energy Blast
Secondary: Energy Manipulation
---------------------------------------------
01) --> Power Bolt==> Dmg(1)Dmg(3)Acc(5)Acc(15)Dmg(37)
01) --> Power Thrust==> Acc(1)
02) --> Power Blast==> Dmg(2)Dmg(3)Acc(15)Dmg(37)
04) --> Energy Punch==> Dmg(4)Acc(5)Dmg(11)
06) --> Power Burst==> Acc(6)Dmg(7)Dmg(7)Dmg(37)Acc(46)
08) --> Sniper Blast==> Dmg(8)Dmg(9)Dmg(9)
10) --> Bone Smasher==> DisDur(10)Acc(11)Dmg(21)Dmg(21)Dmg(40)
12) --> Hasten==> Rechg(12)Rechg(13)Rechg(13)Rechg(42)
14) --> Super Speed==> Run(14)
16) --> Conserve Power==> Empty(16)Rechg(17)Rechg(17)Rechg(19)
18) --> Hurdle==> Jump(18)Jump(19)
20) --> Health==> Heal(20)
22) --> Stamina==> EndMod(22)EndMod(23)EndMod(23)EndMod(27)
24) --> Build Up==> TH_Buf(24)Rechg(25)Rechg(25)Rechg(27)
26) --> Explosive Blast==> Dmg(26)Dmg(34)Acc(34)Dmg(43)
28) --> Power Boost==> Rechg(28)Rechg(29)Rechg(29)Rechg(31)
30) --> Aim==> TH_Buf(30)Rechg(31)Rechg(31)Rechg(33)
32) --> Nova==> Rechg(32)Dmg(33)Acc(33)Dmg(34)Dmg(43)Acc(43)
35) --> Energy Torrent==> Acc(35)Dmg(36)Acc(36)Dmg(36)Dmg(42)
38) --> Total Focus==> DisDur(38)DisDur(39)Acc(39)Dmg(39)Dmg(40)Dmg(40)
41) --> Personal Force Field==> DefBuf(41)DefBuf(42)
44) --> Temp Invulnerability==> EndRdx(44)DmgRes(45)DmgRes(45)DmgRes(45)EndRdx(46)EndRdx(46)
47) --> Force of Nature==> DmgRes(47)Rechg(48)Rechg(48)Rechg(48)DmgRes(50)DmgRes(50)
49) --> Boost Range==> Rechg(49)Rechg(50)
---------------------------------------------
01) --> Sprint==> Empty(1)
01) --> Brawl==> Empty(1)
01) --> Defiance==> Empty(1)
02) --> Rest==> Empty(2)
---------------------------------------------