So I ran a test today to compare the damage and dps between mashing arcane blast and doing arcane blast with the missile barrage after the 4th AB.
Things to consider in this test.
-Im a noobier than noob lvl 80, so my gear is very very carp. Im not joking... its bad.. but its the best I have done so far and will be improved on. Ive still got loads of blue and even green items. My
armory link (for you guys to laugh at).
- I have the following arcane build and glyphs:
http://talent.mmo-champion.com/?mage#8LAeNP4mkG0Xy,-RYHQO,9551
- I tested my dps on the heroic dummy in Ironforge.
- When I started each test I hit icy veins and mirror image (once at the start for both tests).
- I used no potions, gems or anything else to recover mana. The test was to see how long I could sustain the attack before I was out of mana... and what effect it had.
- I used recount to measure scores.
First test was odoms suggestion of bashing AB all the time.
I had a dps of 2626 I was able to do 81990 damage over 33.29 seconds before I was OOM.
2nd test was the more conservative blast barrage combo.
I had a dps of 1594 I was able to do 230001 damage over 2 minutes 27 seconds before I was OOM.
I really really cant wait till I have the gear to sustain mashing AB all the way.
What gear should I be looking for? Any suggestions.. and what gems should I fit with that gear?
Re the tanking.. due to be there being so much DPS... I am busy building a Protection Paladin.. and a Resto Shaman

Just so I get more game time.. but for some reason.. my guild has too many tanks.