I like the 66/soldering idea. I had the KT7A RAID for about two weeks, it has ISSUES. Using RAID by putting a drive on each of the extra IDE's (as recommended) causes you to: 1) Not have more than 3 PCI devices or it won't boot, and 2) no USB. That, and on mine the floppy controller was DOA too. Lotsa people have them, they're good for OC, but I'll never buy another thing from Abit myself.
Without the RAID (and assuming the floppy works) it's probably a great board. The Promise add on idea is a solid one. Myself, I went to the MSI with it built in. 6 PCI slots, plus Promise RAID built in. Also, it was about $125 vs $160, but you might find a better price. I wanted all the PCI slots. Asus has a good option too, a MB with Promise built in.