Just a nitpick:
I disagree with you here. Mastery is a
very powerful stat for us, to the point that I'm prioritizing mastery gear very heavily. A parry/mastery item like Bracers of Impossible Strength is a stronger choice for survivability than the Sandguard Bracers, which wastes a good chunk of its itemization on expertise. Reforging can make up some of the difference, but you're still quite a bit behind. Example, using all pre-DR values (items with high avoidance fare even worse due to DR, so this is really a "best-case scenario" for items like Sandguard Bracers):
Sandguard: 190 dodge: 1.0752% avoid from parry + 0.1924% from STR, 1.2676% total attack table coverage
Sandguard with dodge->mastery reforge: 0.6451%+0.1924% avoid, 0.9538% block, 1.7913% total attack table coverage
Sandguard with exp->mastery reforge: 1.0752%+0.1924% avoid, 0.5572% block, 1.8248% total attack table coverage
Bracers of Impossible Strength: 0.7187%+0.2688% avoid, 1.5939% block, 2.5813% total attack table coverage
Similarly, Gryphon-Riders (3.4475% coverage with mast/stam gem) is pretty much a best-in-slot piece because of its favorable mastery itemization. Again, by reforging the expertise into Mastery you can get the Rock Furrow Boots up to 2.3239%, but that's still significantly behind.
A few notes:
- The wowhead tooltips are wrong. It's pretty clear that they're still using the level 80 parry/dodge conversion factor. This is trivially checked; Rock Furrow has 223 rating, which should be about 1.26% dodge using the level 85 conversion factor of 176.7. The tooltip claims 3.42%, which corresponds to 65.2 rating per %.
- You can come up with a general rule of thumb for reforging on items that have an avoidance/threat combination. If an item has A avoidance rating and T threat rating, the break-even point is found by solving (0.6*A/Ca + 0.4*A/Cm)=A/Ca+0.4*T/Cm, where Ca and Cm are the avoidance and mastery conversion factors respectively (Ca=176.7189 for avoidance, Cm=179.28/2.25=79.68 for mastery).
Solving that equation, we find that T = (1-Cm/Ca)*A = 0.5491*A. In other words, as long as the threat stat on the item is larger than 55% of the avoidance rating, you'll get better attack table coverage by reforging the threat stat. This assumes, of course, that you're willing to sacrifice the threat stats.