I hit 2.6 gHz on my A64 3000+ and XP-90, but I had to loosen my memory timings a bit. Running 294x9 on it, Corsair XMS memory @ ~194 (3-3-3-8) on the 133 divider. Ah well, can't complain, everything's stable as can be.
In your situation, I would go for the A64 3200, for both price-performance ratio and the 10x multiplier.