Sigh... okay, I'm already feeling like a jerk.
If you can afford it, I'd buy one of the .13 micron Athlons. I don't believe they ever scaled the Durons down to .13, but maybe an AMD fan could correct me if I'm wrong.
Otherwise, you're begging for heat trouble. AMD CPUs in general are not the best for recording, though plenty would disagree with me. I also wouldn't get one of the older Pentium 4s. Again, too much heat. The Northwood might work well.