well, remember the x800 is the same as the 9800xt, so the x800xl is basicly a 9800 xt pro, its only a slight bit better then what you have. i woulddnt limit yourself to just 1 card, maybe see how much you want to spend and get it within 10 dollars of that. another option to improove performance would be to put some ramsinks on your 9800 pro and run the ram 10% faster