You'll get varied opinions, but I just want to stick in a vote for the ASUS A7M266 DDR board. This was my first ASUS system and it was a pleasure to build; rock solid from the first boot. Good performance using Crucial PC2100
RAM. I only just finished this last week, but so far I have had zero problems with the board. Some complain that it is not good for over clocking, but you can easily tweak up the FSB and voltage for some quick over clocking. Good quality components on the board also. It came with the extra USB ports (via a header on the MB and the included hardware) and that was handy for me. Good luck.