I would personaly get rid of the stealth powers for stimulant/aid self...mainly cause when you get your toggles on stealth aint gonna safe you..but that REALLY depends on your style of playing..
(edit (then stealth at 44/47)
Ahh, that's an error. I dropped stealth for frostwork in what was my only change to the planned build(didn't realise I couldn't run that and arctic fog at the same time) 
What kind of role are you thinking of playing in PvP, a buffbot? Or a hardcore debuffer/blaster? Ice/cold is a very tight build, so curious to hear what role are you thinking of?
Both instances i really would recommend going black scorpion mastery for the web grenade -jump, it's what seriously makes ice/cold/mace one of the most evil builds to fight against.
Debuff mainly. My damage output at present is pretty good but not enough to really put away a non squishy so the build is all about the slows.
Frostwork and the shield give me some team buff but are an afterthought, rather than a playstyle. With no heal and so many debuffs, trying to squeeze it for buffs seemed pointless when I could of just rolled a kin or another thermal.
Can't take Mace as I've already taken Scirroco, purely for power sink. The rate Ice chews through end is quite high already so not going for Power Sink would have meant dropping damage and recharges for end reductions.
One on one, I can see the advantages but in prolonged zone battles, I'd be good for one target then off hiding unless I had a pocket kinetic.
I've picked up power sink and the patron armour so far but even the armour has put a big dent in end consumption so I'll definitely need a rethink towards the tail end of the build once I get my last 5 levels.
OK, I've been levelling and PvP'ing my Ice/Ice Corruptor for a bit now and I do love playing him but have a few areas that are troubling me a bit. The problem is that i'm not really sure how to improve them and while I annoy the hell out of players and pick up some kills, I do die a lot. My lvl 1-40 build is below:
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Exported from Ver: 1.7.6.0 of the CoH_CoV Character Builder - (http://sherksilver.coldfront.net/index.php)
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Name: Exofrost MK IV
Level: 41
Archetype: Corruptor
Primary: Ice Blast
Secondary: Cold Domination
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01) --> Ice Blast==> Acc(1) Acc(3) Dmg(17) Dmg(19) Dmg(29) EndRdx(33)
01) --> Infrigidate==> Acc(1) Acc(3) Rechg(17) Rechg(31) Rechg(34) EndRdx(37)
02) --> Ice Bolt==> Acc(2) Acc(5) Dmg(15) Dmg(19) Dmg(29) EndRdx(33)
04) --> Ice Shield==> DefBuf(4) DefBuf(5) DefBuf(9)
06) --> Snow Storm==> EndRdx(6) EndRdx(7) EndRdx(7)
08) --> Freeze Ray==> Acc(8) Acc(9) Hold(11) Hold(13) Hold(15) EndRdx(37)
10) --> Aim==> Rechg(10) Rechg(11) Rechg(13)
12) --> Combat Jumping==> EndRdx(12)
14) --> Super Jump==> EndRdx(14)
16) --> Swift==> Run(16)
18) --> Hurdle==> Jump(18)
20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> Bitter Ice Blast==> Acc(22) Acc(23) Dmg(23) Dmg(27) Dmg(27) EndRdx(33)
24) --> Hasten==> Rechg(24) Rechg(25) Rechg(25)
26) --> Super Speed==> EndRdx(26)
28) --> Acrobatics==> EndRdx(28)
30) --> Benumb==> Acc(30) Acc(31) Rechg(31) Rechg(34) Rechg(34) EndRdx(40)
32) --> Arctic Fog==> EndRdx(32) EndRdx(36) EndRdx(36)
35) --> Stealth==> EndRdx(35) EndRdx(36) EndRdx(37)
38) --> Heat Loss==> Rechg(38) Rechg(39) Rechg(39) EndMod(39) Acc(40) Acc(40)
I took Scirroco as my patron to gain access to the all important Power Sink and now i'm trying to weed out the weaknesses I still have.
First off, it really is a squishy. A lot of people will target me as soon as I start dropping the slows on them as they really are a killer, especially for regens who take particular exception to me. The fact it doesn't have a heal and i'm often a high priority target is apparent very quickly unless I have my own personal healer backing me up(which team mates get the hump with when I'm monopolising the thermal).
Second, I'm not sure which powers to pick as my last three and where to put my slots.
Medicine Pool - With a pool still available, I could fit aid self in. I have no experience with this power but assume it will need 6 slots so will have to take a preliminary power at 44 and aid self at 47 to enble me to get the 6 slots in.
Patron Pool - I have the armour, hold and pet available. Not interested in the pet but the other two could be useful. Could 4 slot the hold if I take Medicine Pool and fit it in at 49, to stack with freeze ray, no idea what the animation and rooting are like though.
Leaping - another area for me is that I don't often use SJ as it means taking off CJ which is my immob protection. I could drop it altogether but that would mean losing acrobatics as well. While the mez on acro is not worth bothering about, not sure how much I will miss the knockback protection until it's gone. This change will allow me to fit the med pool in a lot earlier though, in time for Sirens but I will have to find 4 leaping slots to split between CJ/Hurdle as Acro and SJ are unslotted.
Other pools - Could look at another pool such as the presence one for it's fears or TP for TP foe. None of them seem like obvious choices but can be useful in certain situations.
More Primary/Secondary Pools - The obvious gaps in my main powers are the area specific AoE's, Ice Storm/Blizzard/Sleet. I've avoided these as animation on them is long so by the time you drop them, the targets have normally fled. However, they are all pretty powerful and if I drop Snow Storm on someone, that could slow them enough for me to use these.
At the moment, I'm completely undecided so any input would be appreciated.