Is one of these cards my best bet, or are there other options? The x800xl is closer to my budget, but the 6800gt seems to be a better card--is the extra money worth it? I'm just looking for best overall game performance.
Also, would there be any compatibility issues with my Asus A7N8X Deluxe and AMD XP "Barton" 3000+? Would this CPU keep up with one of these fast GPUs?