The only reason to stance dance as prot is for Shattering Throw. Even if you need a slow, Shield Bash provides a daze effect, you you don't need to hamstring, unless you really need a slow longer than I think 4 seconds. Additionally, at level 85, you can pick up Piercing Howl, which is a longer duration spammable AoE slow effect usable in defensive stance.
For stats, there's some debate still on whether to stack stam or mastery, but most people seem to be leaning towards a balance, with a bit more emphasis on mastery. Most damage you take as a tank is physical boss swings, mitigated by armor and blocks, or avoided. You aren't (usually) in danger of getting globaled anymore, so you don't need as large an HP cap, and it's better to take less damage. You can pretty much avoid hit and expertise entirely if you're playing well. Armor is always a good stat too.
Kathy, I said, "I'm lost" though I knew she was sleeping
I'm empty and aching and I don't know why
Counting the cars on the New Jersey Turnpike
They've all gone to look for America