which of these two?

P4C800 DELUXE 129.00$ Refurb http://www.asus.com/prog/spec.asp?m=P4C800 Deluxe&langs=01

P4P800 Deluxe 142.00$ new http://www.asus.com/prog/spec.asp?m=P4P800 Deluxe&langs=01

P4C800, the only real difference between the Canterwood and Sprindale options was PAT, and apparently thats being enabled on the sprindale - so I would just go with it...strangley enough the benchmarks I have seen show the Abit IS7 beating the IC7, dunno whether its the same in this situation

It depends a great deal if you are going to run raid and what type of raid. That p4c800 version you listed has no ICH5R only ICH5, it will choke the bandwidth.

I have the p4p800 and I love it. If you already have the p4c800 it isnt worth changing but if your buying new i would get the springdale p4p800 or the newer p4c800-E (note the E revision).

the p4c800 that you listed isnt a bad board or anything but in terms of the other boards Asus has available, its missing several things they later corrected.