If we wern't allowed to joke about then i think about 99% of the active forum would be banned!
I spent £550 on the PC, or $880 for the yanks here. I've tested it and i can get about 25 FPS on super high graphics on SSE according to fraps, it runs super smooth.
With 64bit it doesn't really seem to have a limit, you're just limited to the amount of slots for the RAM, my motherboard has 4 slots so i can get 4X4GB which is 16GB max.