Ok, you do realize that the Athlon is not much more unstable than the P4? It is true that very stable Athlon mobos seem few and far between, but the ones that are have just the same uptime as a P4 on an Intel reference board.
By deciding to buy the ECS mobo, you are sacraficing the very thing you say is the reason you bought the P4 in the first place: stability! Basically, you say you are willing to pay more for less speed, if it gives you stability, and yet you aren't even adhereing to your own guidelines.
If you really are willing to pay more for stability, at least go with reliable Intel-based mobo. Or, you could even go with the ABIT KG7-RAID and a 1800+, paying $60 more for a much faster processer, great stability, and the ability to mirror your data *without tweaking*.