I'm a HUGE Priceline fan but I'd avoid Priceline in the 3* range -- you're likely to get the Holiday Inn Main Gate East, and you may wind up paying more than you would if you booked the hotel direct (through it's website, not the HI's).
the most common Priceline hotels (including the rates they hit at) over the past several months (Disney-area only)... [this list is NOT complete, just an idea of what you'll most likely get]
resort: Hilton ($60), Omni / Gaylard Palms ($95+), sometimes Hyatt ($100+)
3*: Holiday Inn MGE ($45), Radisson Worldgate ($35-$45), Sheraton Safari (it's been hitting at $55 lately... changing trends from what's been common the past year or so)
2.5*: the former AmeriSuites ($31), Orlando Sun Resort ($38), Orlando Vista Hotel ($44)
2*: Best Western Lakeside ($25), Seralago ($30)