Bink, I have read that post where you talked about the 4204 more haste. Just wanna ask how you got those numbers. Because when I tried simming, full haste always yielded a noticeable (4Kish) DPS increase over the mixed haste/mastery combo you're suggesting. Am I missing something?
http://us.battle.net/wow/en/characte...domeo/advanced
Nonetheless I have put some mastery gems on my newer pieces of gear anyways since we just downed H prim and H Duru a few weeks back and Chain Lightning was strongest on those fights.