I opted for the Gigabyte 8irxp for a few reasons.
I am tired of Via and miss the stability and flexibility of the old school Intel BX chipset. That rules out damn near all the other options. Via I don't like due to my KT133, KT133A, KT266A experiences. Good chipset if you were willing to work at it. SiS I don't know enough about to trust.
So those are the reasons for the i845 chipset. As far as why Gigabyte:
USB2, RAID133, Intel NIC, average onboard sound, and STABILITY. Both Anand and Tom loved the board. The MSI I didn't go for because I have had 3 DOA MSI boards and just don't trust there QA.
The Gigabyte has the highest available VCore settings, and that goes a long way. I will let you know how things go.
EtOH