Theres even the Power Color Radeon HD 6850 on for $139 plus free game why not that one why pick the HIS
I was looking for a factory oc'd one. IMHO, video card overclocking is better left to the factory, they have to guarantee that speed, vs overclocking on your own with no guarantee in a performance bump, and a voided warranty if you fry it. Thats how I look at it anyway.
What resolution is the monitor you'll be using for games? That will determine which card is best for you. If you're planning to play games at 1080p for a while, you can shoot as high as your budget will allow.
And what are some of the games you plan to play (currently available or in the near future?). If you plan on getting a 1080p monitor in the near future, I would shoot for a 7870. Soon, the gtx 670 will be out and that should perform very well for its pricepoint ($350).
For a 1280 x 720p tv, though, almost any card mentioned above will give you good frames.