Quick Questions from a blood DK

What are:

Dodge/Parry cap.
Mastery Preference.
Hit chance

and all those nifty things I'm missing because I'm fail like that.
In order,

No cap.
Depends on if you're stacking avoidance or not.
Your preference.
Avoidance being dodge and parry stacking, right?

Is there a preferred choice [or stated of the better] between Mastery and Avoidance?
Yes, getting dodge/parry instead of mastery.

In 5 mans, mastery, but avoidance will do just fine. For raids, whatever your healers like most.
Thank you :D
I try to stack both as much as poosible. I try to keep my avoidance within 2% of each other and stack/reforge for mastery where I can't stack/reforge for avoidance.
If minimizing the DR, buffed dodge should be right around 4% less than parry if you're using Swordshattering. If you aren't, they should be pretty even.

Or just look at the ratings and keep them roughly even, since that's what causes the DR.

In order,

No cap.
Depends on if you're stacking avoidance or not.
Your preference.

Yeah, no cap really..

But you can't get much better than 102.4% now can you?
Well, of course not, but it's better to just say no cap so people don't get confused and somehow think there is a realistically achievable cap. Like, no reason that I can figure out, people seem to think 2200 rating is "the cap."

Not that you were serious anyway, but you'd need 38640 stat points--perfectly diminished and all going toward dodge/parry--to reach that, which is more than 8 times what you can get on gear currently.