Interesting numbers. Those are retail prices I'm assuming. Slickdeals got me a 4850 for 40 bucks ($97.98 on the list) and a 5770 for 86 ($109) on the list. The 4850 paid itself off pretty quick, and I'm waiting for the 5770 to arrive.

Yes, the pricing data is based of Dynamite Deals pricing engine so it's just retail prices - offers available on a consistent bases without rebate trickery.

Bitcoin miners have already purchased the available high-end Radeon HD graphics cards in the States. The Radeon HD 5770 is still available however and may be a good choice according to the payback chart.