Between Gigabyte and Abit...I kind of wish I went Abit, just based on featureset(or lack thereof) and price. The Abit IC-7G is about $10-15 cheaper than the GA-8KNXP but it comes with 2 SATA power adapters - that there is like a $15-20 savings. Also, since I decided to go SATA RAID at the last minute, I won't need the ATA RAID on the GB. Layout-wise though, the Gigabyte is better.
I sometimes question, however, whether or not Gigabyte truly implemented CSA GbE. Their block diagram has the LAN chipset on the PCI bus. It's also funny how Abit didn't even put a 10/100 chip in their IC-7, but Gigabyte did on their lower-end 875P model.