Best GPUs for Mining GPU mining is the way to go, as at August 2011, until something better arrives on the market. There are plenty of GPUs out there, but only a handful offer the best performance when comparing total number of Bitcoins generated vs. power consumed vs. initial purchase cost of the chip.

Which GPUs provide the best performance in regards to Bitcoin Generation vs. Power Consumption?
According to https://en.bitcoin.it/wiki/Mining_hardware_comparison the best GPU in regards to power consumption is the 5970, the tricky part is finding one of those for sale.