With the stat values from the Ret guide from this forum (
http://www.mmo-champion.com/threads/...amp-Discussion) your PvE values would be
Master > Ms > Crit > Vers > Haste
In PvP Ms and Crit have their effectiveness cut in half (50% crit bonus dmg and only one ms roll), so your priority would be:
Mastery >> Vers > Haste > Ms > Crit
Basically Mastery is what you want, Vers is ok, Haste is ok-ish (but not great, as it's reduced in value for a melee as long as they aren't hitting the enemy), ms and Crit are lagging behind when it comes to their dps increase.
For honor gear this is easy: Take the better choice of the 2 for the non-set items and compare your set items to the ones w/o the set bonus and see which one gives you the best stat exchange.
E.g. if you have 1 set item with crit and ms and the off-set piece has haste and crit, it might be better to exchange a piece with ms and haste for something with mastery and haste. Just as an example.
Only take one off-set item though, so you don't lose your set-bonus.
When it comes to the conquest gear, there will be a third choice for every slot, except for the 1250 items and trinkets.
Those items need Ashran reputation and will have versatility on them.
In this case it will be the easiest to use something like the site
http://www.askmrrobot.com to figure out which items give the biggest benefit or use an addon like Pawn where you can add the stat values and have each item's "value" be displayed in it's tooltip.
I've done that for you here, but sadly I can't link askmrrobot pages (or at least don't know how to do so), so I'll just list it here instead:
Code:
Weapon: Str-2h (who would have guessed ^^)
Helm: set piece
Neck: of Cruelty ( Mastery and Crit)
Shoulders: set piece
Back: of Cruelty (Haste and Mastery)
Chest: Ashran chest, called Plate Chestguard, not Chestpiece like the other 2
Wrist: of Cruelty (Haste and Mastery)
Hands: set piece
Waist: Ashran waist, called "of Victory", Mastery and Vers
Legs: set piece
Feet: of Prowess (Mastery and Multistrike)
Rings: of Cruelty (Mastery and Crit) and of Accuracy (Haste and Ms)
Trinkets: Crit Medallion and either the Strength proc one or the Strength on-use one, if you have something to pair it with every
minute. Don't take mastery + on-use vers one, strength is WAY better than mastery still, even with the values given.
So, you'll want Ashran rep for the Chest and waist item.
If for some reason you really don't want to farm Ashran rep, get the set-piece chest and take the off-set Haste and Mastery hands ("Plate Gauntlets"), those are the 2nd best item to replace.
If you want to fiddle around with it yourself, the stat values I've used are from the afore mentioned guide, taken for Holy Avenger and Final Verdict, as you use these atm.
I changed crit from 2.44 to 1.22 and Ms from 2.53 to 1.77, to reflect the reduced value in PvP and reduced haste a tad as well, from 2.11 to 2.0.
Obviously those values can differ a bit if you use other talents or new things are "discovered" by the theorycrafting people, etc.
But atm those should be up to date, so unless suddenly everyone says Crit >>>>>> all or so, this should be accurate. :3
For further evaluation or more in-depth questions the Pally sub-forum would be better though, I think.
I'm not playing ret myself and can only apply general concepts and logic, but there might always be something I'm missing, so feel free to make a thread over there, or ask directly in the theory crafting thread if you have any further questions about in-depth, secret ret shenanigans. ;>