the X800 XT is the only competition to the 6800, the X800 is about twice as good as the 9800, and the 6800 beats the X800 in most benchmarks I've seen (like 5/6 roughly)
I used to like ATI's cards better when it was the 9xx0 series verses the Geforce FX 5xx0 series, but the 6800's take the cake now