I'm pretty sure the cap was always 26 for expertise, but no. For raiding purposes hit and expertise can/should be ignored unless it's some very gimmicky fight or something. Go for full survivabilit yfor now.
We prefer parry slightly over dodge cos they now have the same DRs, but we have Hold the Line talent which makes parry slightly better. Don't make a huge gap between ur parry and dodge though cos then ur losing out on avoidance cos of diminishing returns.
102,4 isn't really obtainable atm, don't bother with that. The consensus seems to be that Mastery > Parry > Dodge for avoidance with a healthy amount of stamina, many say that 160k raid buffed is nice and for more so far it has been enough.
What's wrong with Steelskin? Use it
As for gems a quite preferred method seems to be stam+mastery and stam+parry, naturally stam+dodge is a viable alternative too. Go for socket bonuses in most cases.
I prefer mastery food, cos mastery is pretty much the best avoidance we can have and it has no DRs.