There's really no gearing for CMs, since it normalizes your gear at a 463 ilvl. You can gear for ideal stats, but that's about it.
This. But there are pieces you want more than others
-haste breakpoints are pretty much out of your reach entirely
-gem slots a great, the more you can get the better. Gemslots are counted in the stat budget, but when the stats are scaled down gems are not
-Pure stats tend to dominate over secondary at 463
-Tiers bonuses DO NOT WORK
-any legendary items DO NOT WORK. This does not include the Eye of the Black Prince extra gemslot, but does include the sha gem, meta gem and cloak.
-trinkets are nerfed.
Really everything good is from ToT, but getting full 463 gear works as well since you can better practice when your stats wont be altered. Engineering helm is also badass