Depends on if you plan on running the pally with em all the time or the shammies sometimes as a full group.

If the latter, probably a 51/10/0; something like the following build:

http://www.worldofwarcraft.com/info/...00000000000000

You don't want to miss Thunderstorm; it's just too much fun, and useful for both PVE (well, not really if you bring the pally in, but definitely for a 5-man shammy group) and PVP.

You get instant ghost wolf for a piddling investment in enhancement now, which is great on a pvp server as I see Coilfang is.

This build has totem of wrath - you only need that on one of your shammies now; since it no longer stacks. Getting Elemental Oath on all the shammies is probably overkill as well, but I'm not sure "how many is too many". I do have it on all my shammies and so the 5% crit buff is always up after a single cast.

It also depends on whether you want to respect later or not; you will want Lava Flows eventually, but not until you get the Lava Burst spell at level 75.