PS. On the earlier int/crit vs. crit gemming discussion: I would be using int/crit gems as well, but since I'm doing challenge modes I find I can't reach the haste breakpoint while in the challenge modes if I use int/crit gems. In fact, I have to use quite a few pure haste gems to get there comfortably.
So you're finding that the haste breakpoint is worth reaching even in challenge modes? I would have thought crit would be the best way for plowing through trash as soon as possible.
Yeah, it's hard to test whether or not I do better with reaching the haste breakpoint or just going pure crit, since challenge modes are generally very quick and you don't have much time for analysis. Though, I remember before we all got into raid gear (>463), haste was at a point where it was slightly better than crit. I'm sticking with the haste breakpoint because it's better for most of the bosses (and there's a lot of time you can get from the single-target there), and also because my team is pretty AoE-capable without my extra couple of thousand DPS on trash (demo lock/fire mage/chicken/blood DK), assuming crit does indeed pull ahead for trash.
I'm still not sure at what number of adds crit takes ahead on trash (if at all), but I think at these low stat levels haste is still ahead. Maths would be useful, but there's no challenge mode option in WrathCalcs.