A comprehensive view of a multi-class setup with some examples

[Gadzooks]

That's cool - if it's gear, there's some easy upgrades - Hat of Wintery Doom goes pretty cheap on my server (I make my own, Lock is maxed Tailoring), Dark Runic Mantle is pretty cheap, and titansteel spellblades go for around 600g on my server - you can get some decent boosts for about 1-1500g. The jewelry is a bit pricier, which is motivation for my jewelcrafter to level, but she's a rogue, and I don't know if I want to group her through Northrend. Still pondering that one.

Just spend some time at the gear profiling sites, you should be able to gear the mage up fairly easily.

[Nuclearone]

Just a little update from this admittedly old thread. My dps numbers in mostly tier 9 for your average heroic boss now (with heroism and cooldowns):

Mage: 7-9k
Balance druid: 5k
Survival hunter: 4.5k
Paladin tank (I switched from dk and love it): 2300

Much of the reason for such high numbers is that bosses are now dead well before heroism finishes, and the mage usually still has mirror image up at the end. Mage spike damage is incredible.

Regards