Your rig looks great the way it is. Only you will know if you demand more. Do you play at very high resolution? What monitor do you have? What games need improvement? If you are gaming above 1280x1024 and want to max out AA/AF, then yeah you'd see an improvement in many games.Honestly, your sitting pretty so I'd wait and see how things shape up. For instance, so far COD2 is showing huge gains in a 512MB X1800XT over any 256MB card. IF the 6800U isn't enough, upgrade. Otherwise hold out and see how things are around the holidays with new cards, drivers, and games all around release.
I'm 98% happy with my BFG 6800U OC, but I game at 12x10. If I had a 24" LCD and gamed at 1920x1200, I'd want a more powerful GPU. I went to 2GB of low latency ram which further smoothed out BF2, and upgraded from an A64 3000+ @ 2.2GHz to an A64 4000+ (only becasue I needed a 3000+ for another machine) at stock speeds. Anyway, the cpu/5X HTT/LDT, tight mem timings) helped me gain a few fps in Farcry and NFSu2. I'm NF3 & AGP, but even if it was NF4 I wouldn't upgrade this gen even though I really want a X1800XT
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