Right now, my choice for my own system (and what i own currently) is the XP1700+, in the retail box from Newegg for $138.95 shipped.
For building a system for someone else, the absolute best value in CPU's today has to be the Morgan 1.0 ($58.95 shipped from Newegg).
There are plenty of stable platforms to use for AMD systems, despite what some naysayers might conclude. Statements like:
<< "To me, price/performance is not so much as important as guaranteed stability/compatibility. So for me, it's Intel." >>
must truly warm the hearts of the marketing people at Intel. Saying Intel makes more stable processors is as silly as saying that Exxon gas is better than Chevron, and you're willing to pay substantially more for it. I'd say the true source for system instability is perhaps 75% of the time user error/overly aggressive overclocking and performance boosting tactics, 24% of the time a software/OS issue, and maybe 1% of the time a CPU issue.