This PowerColor X800 GT card is quite amazing for its generation. By using R480 core, it has a quite high core and memory clocks and 8 pipelines and came with 256MB memory.
If you want, this card can be easily overclocked beyond X850 XT PE's core and memory clocks with just few minutes. I've overclocked it and it resulting in an amazing 548 MHz overclock.
Although this card is a downgraded Radeon X800XT with only 8 pixel pipelines, this card is still running great. If you don't need 256MB memory already, or if you're quite tight-pocketed, then you can go grab the 128MB version.