My teams were all in quest gear until 80. Any BOE I got I sold or disenchanted. At 80 I started farming specific items out of non-heroics to start gearing up, picked up a few things in the AH for my healer and tank, and started farming heroics for gear. At 80 you can get several epics pretty quickly by losing 10 arena games a week, and doing wintergrasp. Titan-forged gear from WG is really good for how easy it is to get.