Ice is single target highest damager, fire/elec/sonic following up closely, fire stated as best aoe though i doubt that. Secondairy Fire and elec win the aoe, energy wins the single target, the rest is more mezz/control based.
FotM damager was known as ice/nrg, secondair they were great mezzer's. Elec is dah drainer, fire is a set for 'the skilled', the rest is all around.
ice in pvp seems highest overal, since there is (except ice and a bit fire tanker) no great resist to ice at all. Unlike elec (nrg) and Nrg (nrg) are way more common resisted.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
Sign the petition, dont let CoH go down! SIGN!
can you comment on my build please, i tried for a pve damage build. ignore the levels im slotting at, they kind of messed up, im quite new to the coh planner and sometimes forget to slot certain powers, dont do that ingame tho 
Exported from version 1.5C of CoH Planner
http://joechott.com/coh
Archetype: Blaster
Primary Powers - Ranged : Ice Blast
Secondary Powers - Support : Energy Manipulation
01 : Power Thrust dam(01)
01 : Ice Bolt dam(01) dam(3) dam(3) acc(7) acc(7) recred(11)
02 : Ice Blast dam(02) dam(5) dam(5) acc(9) acc(9) recred(11)
04 : Build Up recred(04) recred(31) recred(31)
06 : Aim recred(06) recred(33) recred(33)
08 : Hasten recred(08) recred(13) recred(13)
10 : Bone Smasher dam(10) dam(15) dam(15) acc(17) acc(17) recred(19)
12 : Ice Storm dam(12) dam(19) dam(21) recred(21) recred(46) endred(46)
14 : Super Speed runspd(14)
16 : Hurdle jmp(16)
18 : Bitter Ice Blast dam(18) dam(37) dam(40) acc(42) acc(42) recred(42)
20 : Health hel(20)
22 : Stamina endrec(22) endrec(23) endrec(23)
24 : Assault endred(24) endred(25) endred(25)
26 : Bitter Freeze Ray dam(26) dam(27) dam(27) acc(29) acc(29) recred(31)
28 : Conserve Power recred(28) recred(37) recred(37)
30 : Power Boost recred(30) recred(36) recred(36)
32 : Blizzard dam(32) dam(33) dam(34) endred(34) endred(34) recred(36)
35 : Boost Range recred(35) recred(46) recred(48)
38 : Total Focus dam(38) dam(39) dam(39) acc(39) acc(40) recred(40)
41 : Snow Storm endred(41) endred(43) recred(43) recred(43)
44 : Frozen Armor endred(44) endred(45) defbuf(45) defbuf(45)
47 : Hibernate recred(47) recred(48) recred(48)
49 : Stealth defbuf(49) defbuf(50) endred(50) endred(50)
-------------------------------------------
01 : Brawl Empty(01)
01 : Sprint Empty(01)
02 : Rest Empty(02)
Ice Storm and blizzard suck unless you're in a team with good trollers/tanks. You might want to skip them, and aid self. Slot it 3 heals, 2 interupt reductions, 1 recharge.
If you plan on PvP, skip assault and conserve power for combat jump and Superjump.
Bitter Freeze ray sucks, get the Freeze Ray instead. You dont want a 4 sec animation time attack.
Boost Range is almost perma with only 2 recharges. You can skip a slot there.
Drop defence buffs in stealth - The base value is too low to be worth enhancing.
A Paragon Defender
conserve power is imo worth it though. I dont leave home without it.
here we go, second attempt lol. i droped stealth aswell, i didnt know what to get for the last power, was between: flash freeze, frost breathe and blizard (and more, but they were the ones i had in mind)
Exported from version 1.5C of CoH Planner
http://joechott.com/coh
Archetype: Blaster
Primary Powers - Ranged : Ice Blast
Secondary Powers - Support : Energy Manipulation
01 : Power Thrust acc(01)
01 : Ice Bolt dam(01) dam(3) dam(3) acc(5) acc(5) recred(9)
02 : Ice Blast dam(02) dam(7) dam(7) acc(9) acc(11) recred(11)
04 : Energy Punch dam(04) dam(15) dam(15) acc(17) acc(17) recred(19)
06 : Build Up recred(06) recred(27) recred(27) thtbuf(40) thtbuf(43) thtbuf(46)
08 : Aim recred(08) recred(34) recred(36) thtbuf(46) thtbuf(46) thtbuf(48)
10 : Freeze Ray acc(10)
12 : Hasten recred(12) recred(13) recred(13)
14 : Super Speed runspd(14)
16 : Bone Smasher dam(16) dam(29) dam(29) acc(31) acc(31) recred(31)
18 : Bitter Ice Blast dam(18) dam(19) dam(21) acc(21) acc(23) recred(23)
20 : Hurdle jmp(20)
22 : Health hel(22)
24 : Stamina endrec(24) endrec(25) endrec(25)
26 : Conserve Power recred(26) recred(37) recred(37)
28 : Power Boost recred(28) recred(36) recred(37)
30 : Aid Other hel(30)
32 : Aid Self hel(32) hel(33) hel(33) inttim(33) inttim(34) recred(34)
35 : Boost Range recred(35) recred(36)
38 : Total Focus dam(38) dam(39) dam(39) acc(39) acc(40) recred(40)
41 : Snow Storm recred(41) recred(42) recred(42) endred(42) endred(43) endred(43)
44 : Frozen Armor endred(44) endred(45) defbuf(45) defbuf(45)
47 : Hibernate recred(47) recred(48) recred(48)
49 : Blizzard dam(49) dam(50) endred(50) recred(50)
-------------------------------------------
01 : Brawl Empty(01)
01 : Sprint Empty(01)
02 : Rest Empty(02)
*
Next time try to put it on the noncolored version 
Anyway, i would suggest going for SJ set instead of the SS, specialy in RV and sortlike it saves alot of annoying moments. You can drop Boostrange and go CJ/SJ, boostrange is my '1 too many buffs to go' power.
Out of my head i took:
Primairy:
Ice bolt
Ice blast
Freeze ray
Aim
Ice Storm (see a stalker? pop it - good recharge)
Bitter Ice Blast
Blizzard
Secondair:
Power thrust
Bonesmasher
Powerboost
Conserve
Total Focus
Buildup
Elec Epic:
-Elec shield (yup, you can fight plight with it )
-Static something (the hold power - 2x hold is nice)
-EMP pulse
I'd like to point this power, it has a 1000 sec recharge wich sounds long. But (here comes the but) 3slotted recharge/endmod and powerboost drains even lvl boss Endurance completely. Base disorient (unlike defenders hold) is 30 seconds (mag is strong enough to disorient bosses), vaguard+powerboost = 90 (!!!) seconds.
Now slot this with 3x hold, vanguard, powerboost and use it in PvP (30 meter aoe). You're talking 120 seconds disorient (slight lower in PvP though, PvE it is 120). My favo panic button.
Whole fitness set (duh)
Whole Leaping set (kb = annoying = hellow acrobatics)
Speed pool Hasten (duh)
Now you can leave acrobatics and EMP out, going for medicine pool. I havent done much PvP yet with my build, but in PvE its a really nice setup to play with. I couldnt see any other power to drop (maybe ice storm) to get medicine in.. i just rely on insperations.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
Sign the petition, dont let CoH go down! SIGN!
I have an Ice Blaster. I run with no ACCs as I have Targetting Drone. With 1-2 ends and 1-2 recharges in each attack I can blast for ages before running out of end.
Freeze Ray is worth 6 slotting. Without any Holds it is okay, with 6 slots ( ACC, 3xHOLD, 2xRECHARGE for me ) it is truly awesome. You should at least put 3 or 4 slots in it though.
Frost Breath may be worth getting for AOE damage. With 1 range SO you can stand at range and use your 3 blasts, Freeze Ray and Frost Breath. I find it essential for teams.
Bitter Freeze Ray is only really any good as an opener against bosses followed up by Freeze Ray and other single target attacks.
Your slotting order seems a bit odd. It looks like you are six slotting attacks in turn, I would slot things in a more balanced way, giving 3-4 slots and then spreading them around. Ice Blast and Ice Bolt should probably get equal slotting initially, as for the melee attacks, it depends how much you use them. I would 3 slot Aim and Build Up far earlier as having one of these up most of the time at level 22 is a godsend.
I normally only really concentrate on the first 25 levels or so when initially doing a build, anymore seems excessive to me and generally I find that slotting order gets too complex.
@Unthing ... Mostly on Union.
Having recently got my defender to 50 im looking to start a new alt. I want a very high damage blaster, AoE would be prefered but if you can get more single target damage without AoE id prefer that. From what i have gathered fire is the hardest hitting primary, then possibley energy for secondary, due to the buffs and strong melee attacks. If anyone would be as kind to post a very high damage blaster build (not necesaraly fire/nrgy), id be very gratefull. Thankyou in advance. Healer.
*