MSI reference model (unlockable shaders) 2gb 6950's are $280 bucks on newegg, $260 after rebate.  I'm getting over 400 mhash/s with unlocked shaders, 950 mhz core, 600 memory, 53% fan, and I'm using the flags -v -w128 -f0.

Link to the card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127555&cm_re=6950-_-14-127-555-_-Product