dell and amd

Why oh why can’t Dell just break down and start offering some AMD chips in its PowerEdge line of servers? I’m shopping around for a powerhouse server that I know I can get a rock solid support agreement with (Dell’s 4-hour same-day response). I’d love to find a Athlon64 machine, but if I don’t come up with anything, we may end up custom building it in house, or having to go with a Xeon box from Dell. This will be a mission-critical box, which is the only reason I’m even looking at someone else to buy from rather than build it in-house. Thoughts? Suggestions?