If he's going to be teamed, why worry about survivability? Normally you don't pull a ton of aggro on a team unless there's no Tank or Brute and not a lot of control so why not build for recharge and damage and rely on inspirations or just running away for a few seconds on the rare occasion you do get too much aggro? You may faceplant occasionally but you'll do more damage the rest of the time because you aren't wasting set bonuses and power picks on softcapped defense you'll rarely need.
That's not to say you can't get some defense or resists, just don't sacrifice offense for them. The usual Thunderstrikes / Obliterations / etc... will give modest defenses and inspirations can do the rest. 
Cascade, level 50 Blaster (NRG/NRG since before it was cool)
Mechmeister, level 50 Bots / Traps MM
FAR too many non-50 alts to name
[u]Arcs[u]
The Scavenger Hunt: 187076
The Instant Lair Delivery Service: 206636
Here's a teaming build.
I went for decent defense so that modest buffs (or one luck) will get you to S/L/Ranged soft cap but concentrated mainly on getting recharge.
It's a quick build so it could probably be improved.
Code:
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- @DSorrow - alts on Union and Freedom mostly -
Currently playing as Castigation on Freedom
My Katana/Inv Guide
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either. -Einstein
Okay I cooked up a build for my friend who has a Archery/Mental Manipulation blaster. He wants to update his favourite blaster to take into account inherent fitness and the alpha slot. He is building it to team exclusively and isn't sure how the build would play or even if it would work properly etc.
I made him a build that's got high s/l def (soft capped) and good recharge as well as stealth and hibernate to increase survivability. The damage alpha (Musculature Core Paragon) and all its benefits seem to kick out good damage on this build too. Having said all this my friend doesn't know whether the build would survive well in teams or whether the force mastery patron is better (he's thinking Repulsion bomb, Inv. shield and Personal Force Field might be better than a high defense build)... then again he's also not sure whether phase shift would work better than Personal force field or a generally high defense build for survivability.
Any advice chaps? I've not actually ever played the sets before so I can't really tell him anything about the playability of the build.
Here it is: