First piece should be chest. It's best in slot. (As are the gloves.)
When you know that hit and expertise is not as important anymore, why do you reforge for them? You should actually reforge away from them towards mastery (and parry/dodge if not possible). Same for gems and enchants. Don't gem for hit and expertise. (If you use an item for both specs, mastery is still ok as a stat.)
Reforging should be like this:
a) If an item has no mastery but hit/expertise/crit/haste reforge the highest of those stats to mastery.
b) If an item has dodge+parry reforge the higher one of them to mastery.
c) If an item has mastery use the other stat to balance parry and dodge as much as possible.
Parry and dodge should be "close together but parry a little bit higher than dodge". That's because of Hold the Line. You should consider this buffed and look at the ratings not the percentage. Parry should be about 1-3% higher than dodge in the end.
Gem like this:
- If an item has no intersting bonus, go for pure mastery. Else:
If you have questions why this is a good way to go, don't hesitate to ask them.
I give you an example what to do with your current gear:
Head: ok - another option is to reforge expertise -> mastery, this would lead to a better coverage of the combat table but less mastery, which is better depends on your overall gear
Shoulder: ok - more or less the same as with the head for hit->mastery
Wrists: reforging ok - same as with head and shoulder, but don't enchant for hit
Hands: dont reforge for hit, reforge dodge -> parry
Waist: use pure mastey gem on prismatic socket, probably reforge dodge -> parry
Legs: reforge hit -> mastery
1. ring: reforge hit -> parry
2. ring: +
1. trinket: reforge parry -> mastery
2. trinket: mastery gem (would be ok for dmg-spec, too)
weapon: reforge hist -> parry, try to get the big enchant
shield: reforge hit -> parry
ranged: reforge crit -> parry if you don't need it for dmg spec, if you need it just undo the enchant