Pandaclysm Arcane Mage rotation

[halabar]

So started working on an arcane mage rotation, based off the reccomended rotations over at: http://www.icy-veins.com/forums/topi...ts-and-glyphs/

And sofar, I have the following...

/castsequence Arcane Blast,Arcane Blast,Arcane Blast,Arcane Blast,Arcane Blast
/cast Nether Tempest
/cast Mirror Image
/cast Arcane Power
/use Brilliant Mana Gem

with Arcane Missiles and Evocation as manual casts. Trying to figure out how to get Arcane Missiles in a macro since it a) is based on a proc, and b) is channeled. So how do you get it in a macro without the channeling being broken?

I'm also eventually running out of mana with both mana gem and evocation still on CD.