I geared up all my shaman in 100% pvp gear. For my tank, I ran some normal instances and got a bunch of stuff crafted. I did some heroics back when my tank had about 22k hp and my shaman were in savage pvp gear, and they were tough but doable (needed the shields).

I took a break and went back to farming heroics when 3.2 came out, in full deadly/furious gear on the shaman and tank with 28k hp. They were super easy at that point. I farmed badges and ToC to get my shaman in 2 piece tier 8.5 and several other pve pieces, and my tank at 31k unbuffed, and now I kill the bosses without even having to heal my tank. Would love to get more gear with +haste though, that really seems to up the dps in heroics.