Looking for Group based Blaster build.

Topic says it all, i am making a Blaster for group purposes, going to be playing with buddies, i am looking for the most effective group build, please send me some good builds/set ups, thank you.

Playing around in mids... (yay stuck at work all day!) I thought this looked like a damn fun team build. Psycho AoE blapping.

Hero Plan by Mids' Hero Designer 1.803
http://www.cohplanner.com/

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Level 50 Magic Blaster
Primary Power Set: Radiation Blast
Secondary Power Set: Fire Manipulation
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Speed
Power Pool: Fighting
Ancillary Pool: Mace Mastery

Hero Profile:
Level 1: Neutrino Bolt -- Decim-Acc/Dmg(A), Decim-Dmg/EndRdx(3), Decim-Dmg/Rchg(5), Decim-Acc/EndRdx/Rchg(13), Decim-Acc/Dmg/Rchg(36)
Level 1: Ring of Fire -- Acc-I(A)
Level 2: X-Ray Beam -- Decim-Acc/Dmg(A), Decim-Dmg/EndRdx(3), Decim-Dmg/Rchg(7), Decim-Acc/EndRdx/Rchg(13), Decim-Acc/Dmg/Rchg(34)
Level 4: Irradiate -- Armgdn-Dmg/Rchg(A), Armgdn-Acc/Dmg/Rchg(5), Armgdn-Dmg/EndRdx(9), Armgdn-Dmg(15), Armgdn-Acc/Rchg(37), Achilles-ResDeb%(46)
Level 6: Combustion -- Oblit-Dmg(A), Oblit-Acc/Rchg(7), Oblit-Dmg/Rchg(9), Oblit-Acc/Dmg/Rchg(21), Oblit-Acc/Dmg/EndRdx/Rchg(40), Oblit-%Dam(43)
Level 8: Hurdle -- Jump-I(A)
Level 10: Fire Sword Circle -- Oblit-Dmg(A), Oblit-Acc/Rchg(11), Oblit-Dmg/Rchg(11), Oblit-Acc/Dmg/Rchg(15), Oblit-Acc/Dmg/EndRdx/Rchg(40), Oblit-%Dam(43)
Level 12: Combat Jumping -- Krma-ResKB(A)
Level 14: Health -- Numna-Regen/Rcvry+(A)
Level 16: Hasten -- RechRdx-I(A), RechRdx-I(17), RechRdx-I(17)
Level 18: Cosmic Burst -- Decim-Acc/Dmg(A), Decim-Dmg/EndRdx(19), Decim-Dmg/Rchg(19), Decim-Acc/EndRdx/Rchg(25), Decim-Acc/Dmg/Rchg(43)
Level 20: Stamina -- EndMod-I(A), EndMod-I(21)
Level 22: Aim -- Rec'dRet-ToHit(A), Rec'dRet-ToHit/Rchg(23), AdjTgt-ToHit/Rchg(23), AdjTgt-Rchg(25)
Level 24: Build Up -- Rec'dRet-ToHit(A), Rec'dRet-ToHit/Rchg(31), AdjTgt-Rchg(46), AdjTgt-ToHit/Rchg(50)
Level 26: Neutron Bomb -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(27), Posi-Dmg/Rchg(27), Posi-Dmg/Rng(31), Posi-Acc/Dmg/EndRdx(40)
Level 28: Consume -- Efficacy-EndMod/Acc(A), Efficacy-EndMod/Rchg(29), Efficacy-EndMod/Acc/Rchg(29), Efficacy-Acc/Rchg(31), Efficacy-EndMod/EndRdx(46)
Level 30: Boxing -- Acc-I(A)
Level 32: Atomic Blast -- Oblit-Dmg(A), Oblit-Acc/Rchg(33), Oblit-Dmg/Rchg(33), Oblit-Acc/Dmg/Rchg(33), Oblit-Acc/Dmg/EndRdx/Rchg(34), Oblit-%Dam(34)
Level 35: Tough -- RctvArm-ResDam/EndRdx(A), RctvArm-ResDam(36), RctvArm-ResDam/EndRdx/Rchg(36), RctvArm-EndRdx(37), S'fstPrt-ResDam/Def+(37)
Level 38: Hot Feet -- M'Strk-Dmg/EndRdx(A), M'Strk-Acc/Dmg/EndRdx(39), Sciroc-Dmg/EndRdx(39), Sciroc-Acc/Dmg/EndRdx(39)
Level 41: Scorpion Shield -- GftotA-Def/EndRdx(A), GftotA-Def(42), GftotA-Def/EndRdx/Rchg(42), GftotA-EndRdx/Rchg(42)
Level 44: Weave -- GftotA-Def/EndRdx(A), GftotA-Def(45), GftotA-Def/EndRdx/Rchg(45), GftotA-Def/Rchg(45)
Level 47: Web Envelope -- Enf'dOp-Acc/Rchg(A), Enf'dOp-EndRdx/Immob(48), Enf'dOp-Acc/EndRdx(48), Enf'dOp-Immob/Rng(48), Enf'dOp-Acc/Immob/Rchg(50), Enf'dOp-Acc/Immob(50)
Level 49: Super Speed -- EndRdx-I(A)
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Level 1: Brawl -- Empty(A)
Level 1: Sprint -- ULeap-Stlth(A)
Level 2: Rest -- Empty(A)
Level 1: Defiance
Level 2: Ninja Run

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I don't have a full build, but I'd suggest Fire/Mental, focusing more on cones than PBAoEs. You get great AoEs and high damage for bosses, and you don't have to hang out in the middle of the enemy pack to do it. Even if nothing's shooting at you, getting nailed by splash damage from PBAoEs and such is annoying.

Of course if you know you're going to have lots of defense buffs or other survivability boosts and some healing to handle what damage does get through (like if you are playing on a set team), go Fire/Fire and just obliterate things. Just don't be surprised if you occasionally manage to pull aggro off a Tanker... or two or three of them for that matter. Fire/Fire is absolutely insane damage, with no mitigation whatsoever... but with enough buffs and debuffs you don't need mitigation of your own.

I find the difference between solo and group blasters to be not so much build as playstyle.
Here are some vague ill-organized thoughts on primaries:

Some teammates find Energy Blast to have inconvenient knockback. If you have Electric primary you may synergize VERY well with other electric sets. Sonic increases team damage and has good emergency buttons but is short on individual AOE. Fire does a chunk ton of AOE in a hurry - you can drop minions by the 8-pack without even using Build Up or Aim. (general note: take all the Build Up and Aim type powers you can.)

Other than that, there's a Blaster mini-guide in my sig.