Many more expensive motherboard are no better at OCing than quality mainstream boards.
Surely, you want to stay away from the cheap of the cheap in most cases, but it's certainly possible to get a very capable OC board without spending too much.
Take a good look at the board's VRMs and layout. Read some reviews. Look at screen shots of the BIOS options.
As for features, only you can decide what you need/want.
Originally Posted by intelman
yup. you usually get what you pay for, so i wouldnt just totally skimp on the mobo. but as far as i understand now with intel's unlocked processors the mobo wont be necessary for OC
Unlocked or not, you need good power delivery for a respectable 24/7 OC.
Doesn't mean you need to pay an arm and a leg however.