your FSB is 800MHZ, it supports high RAM speeds
I would personally get a gig of Kingmax PC3500 RAM
That 800 is an overall bus coming from his system being 200x4
Look at his CPU shots dude. He needs PC3200 for his system to be running 1:1 otherwise he'd need to overclock his FSB which with good PC3200 he could do that anyway. If he got PC3500 he'd just be creating yet another bottleneck.
Mr. Tech - Stick with getting some good PC3200
If you want top knotch OC'ing brands let me know and I can point you in the right direction. If you don't want to OC at all then get valueRAM.
But for value and OC'ability you can't go wrong with these:
Mind you to get real high FSB's you'd need quite a bit of voltage. No doubt your board probably maxes out at 2.9v dimm, but they will still overclock. To see really high FSB's and low timings you'd need 3.2v+