for less dps intensive stuff, use a sequende of 3 arcane blasts, then arcane missiles, followed by an arcane barrage. For boss fights, I manually rotate, doing a varying amount of arcane blasts then missiles, and barrage (trick is to cast barrage before the last missile volley hits, and its supposed to receive the + arcane damage from the buff) I always try and make sure my mana gems are up, and I have the glyph that increases mana received and buffs spellpower whenever I use gem. I evocate every cooldown, except on movement heavy boss fights, so i dont waste it (grr on heigan, cast it right when the cast time debuff came on, and wasted it, unless i wanted to stand for 20 seconds evocating...)

I also love evocating when the shammys blow heroism, it goes crazy fast. I also glyphed for self heal on evocate, which can come in handy, and takes a load off of the healers.

I'm need to respec out of pyroblast and into icy veins/improved blizzard. 3x Pom Pyros is fun, but does little more damage than my arcane rotation. I can still do PoM FFB, or PoM ABlast.