Hardware Selection for AMD64 + Linux?

MrClever asks: "After a disaster involving my cat, a pot of coffee and my workstation, I am now in the market for a new machine. I thought I'd jump on the AMD64 wagon and keep running Linux. After some initial investigation, it became clear that ATi, Promise and other manufacturers don't have 64bit drivers for Linux, which rules out most motherboards with onboard P/SATA RAID, thus limiting my available choices. I know you can run 32bit on AMD64, but if I wanted that I'd get an AthlonXP. So, what AMD64 hardware is the best supported in 64bit mode under Linux? Seems NVidia have 64bit drivers, does anyone else?"