You're 8k3a+ can do 200+ easy, problem is I don't think your CPU can handle it, and no 1/6 at 200FSB so your PCI/AGP would be way up there(40PCI/80AGP), those are some big numbers, would be hard pressed to find HDD's and AGP and NIC to handle those numbers.
That's a lot to push, that's why I think XMS3200 is plenty, and then if you decide to do a board upgrade, to one of the NForce2, the XMS3200 would work out real nice(those boards have AGP/PCI lock)
Just notice that this is my 1000th post using this username, I think I need to switch again, or get a life.