1 PC: 3 Shammies or 2 Shammies and 1 Lock

Looking to get some basic ideas/theories for a this setup. I would like to PvP mostly, probably arenas.

Idea 1

Warlock as main used for Dots and CC.
Elemental Shammies stand back and nuke

Idea 2

Enhancement Shammy used as main for DPS/tank
Elemental Shammies stand back and nuke/heal

Any thoughts on people who have done this setup? I have messed around with 2 Elemental Shammies just to get my feet wet and things are going pretty well with it. What specs would you recommend? Also, how about basic combat theory so I can setup macros? With so many options, it is hard to figure out the "best" way to attack. Thanks all

Some issues with the /follow command and having the clone facing the wrong way but nothing too bad.

Any ideas? Thoughts? Concerns? Pie?