Depends on your use, but there's no getting around that headphones in your price range are very inaccurate. If you're just tracking, go with comfortable ones that sound good to you in your price range. If you are going to mix tracks in headphones, I would recommend investing in something like Sonarworks Headphone Edition. At the basic level it's a plugin that has compensating frequency curves for various models of headphones to give them a closer to neutral frequency response. So you would have a better chance of mixing something that sounds good on a range of systems rather than what sounds good through your particular set of headphones. You can also buy headphones directly from Sonarworks, and they will make a custom calibration profile specifically for your personal set of headphones, for maximum accuracy. Adds significantly to the price, of course. I had a quick look at their site, the Beyerdynamic DT 880 Pro's scored quite well without calibration; calibrated they can even keep up with the more expensive Sennheiser HD 650's. Looks like Sweetwater is doing the DT 880's for $229 free delivery right now. Hell, I'd probably buy them if the Australian Dollar wasn't complete shit.