Ok, here are some further thoughts/experiences. I appreciate some poeple will not let go of having 'intel inside', and if a pentium 3 performs better at the tasks your planning on doing then maybe thats the deciding factor, though thats doubtfull IMHO because you can get extra frequency for your mullah if you go athlon and this will reduce any shortfall against the lower speed P3 in certain apps, and extend the lead in many others.
Regardless of the above, as you obviously know about all this and are more interested in stability at this point, I would say that the athlon platform has definately developed in maturity in the last 16 months or so since its introduction.
I bought an athlon system as soon as they were available. I then had a MSI 6167, and it was every bit as sturdy as my K7 Pro is. When the system was about 7 months old back in April, i started to have troubles in games, particularly Q3/UT as it would lock up frequently after a few hours uptime. All the signs pointed to vid card troubles, a TNT2 Ultra at the time. After a miserably failed attempt at fixing the problem on-site (it then crashed after 10 seconds in-game

), the comp was taken in for 'servicing'. When it returned, it had a new SDR Geforce, as they no longer used TNT2 Ultra i had and probably didnt have any left in stockpile. They also replaced the mobo, and as they no longer used the 6167 so i got a K7 Pro, possibly because the original would for certain have disliked the geforce. While they were at it, they gave me a week 41 instead of a week 30 Athlon 500 and replaced the ram, despite the fact i doubt that either were damaged, probably just a precaution. The reason i tell you all this game related stuff is that despite all those changes regarding the problems, the system
never had a stability problem in windows, it was like a rock. I went for weeks at a time without crashes,
in win98SE, although obviously i rebooted once every day or two cause its not the most memory efficient OS
Getting back to the current socketA platform, i would like to point out that anandtech itself is served largely by 1GHz T-Birds on MSI K7T Pro's. If your looking for stability, im sure youll find many others on the board like me that will give kudos to MSI.
My personal opinion only.