Originally Posted by
Metaphoric
1) Don't consider Noxxic/Icy-Veins valuable sources of class information. The Icy-Veins BM guide is outdated, and Noxxic is just urgh.
In that gear level I'd personally go BM for all fights except Immerseus, Norushen, Sha of Pride, Iron Juggernaut, Kor'kron Dark Shaman, Malkorok, Spoils, Thok, Paragons, and SV for those bosses.
No harm in getting well acquainted with both specs, better than becoming a world champion at Survival and having to transition into BM as a total noob (not that the specs play THAT differently, though they have some distinct mechanics to each their own) - just go with a Crit > Haste > Mastery setup for both specs.
If you wanna go BM full-time-tryhard-mode at a higher gear level later (565+-ish but depends on specific pieces), consider a Haste > Mastery > Crit reforge, but it really doesn't matter a whole lot.