Too bad mana springtotem doesn't stack. :cry:
Though 4 healing stream totems would equal 400+ health per tick, so I'd probably use 4 healing stream and 1 mana spring in most cases.

With Shaman's Lightning and Chain Lighting cast times being reduced and receiving a reduced +damage coefficient, I'm wondering if their reduced nuke capability makes it worth it.

I actually have a level 57 BE paladin in storage who I've been dualbox leveling with a hunter, so Latency's suggestion of 4 warlocks + 1 priest with a pally to tank heroics and such does make a strong case.

Despite the warlock nerf bats in 2.2 and 2.3, I think 4 warlocks + 1 priest or 3 warlocks + 1 priest + 1 holy paladin (most 5v5s do better with 2 healers, especially if a moonkin cyclones 1 healer).

So far my picks would be either
4 warlocks + 1 priest (with pally on side for heroics)
4 shamans + 1 paladin

Most of this discussion is up in the air atm, probably once 2.3 classes changes are set in stone, I may change my setup. I still working on my computer and display setup, more on that later.

Edit: more spelling mistakes than I care to admit. lol