If you want to pvp primarily, but to have a pve option.
Take a look at Feral/Balance druid (dual-spec) with 4x Shaman.

You'll get 13% spell power from the druid.
Can either drive the druid and manually manage eclipse.
Or approximate eclipse procs and not really care about managing them.
Either way, I'd leave the druid in moonkin full time, and heal with shammies if needed.

That then also gets you a Feral tank.
Which should open all 5-man heroics to your team.