I appreciate all the suggestions from my previous post, and have made some changes to my list (see below). I still think I would like to go with ubuntu. If I can't make it work, I can resort to Windows. For the RAID 1, I'm not sure whether I should go with a hardware or software raid, so any suggestions along these lines would be appreciated. Please let me know what you think about the list below. Remember my main goal is for a low cost, high-capacity RAID 1 file server. Of course I'm most concerned about any incompatibilities that I haven't caught, and if there's anything I could save money on.
Foxconn A78AX-S (AM2+/AM2 AMD 770 ATX)
(I'm totally ok with only having two memory slots)
AMD Athlon 64 X2 5000+ (Brisbane 2.6GHz 65W Dual-Core)
WINTEC AMPX 2GB (240-Pin DDR2 800)
(The case comes with one, but its probably not very good)
Rosewill RV350-2 350W ATX 2.2
$30 inc. shipping
Western Digital Caviar GP WD10EACS 1TB 5400 to 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive
$170 X 2
APEX TX-346 ATX Mini Tower
(I'll probably order this from Amazon instead since it's cheaper with free shipping)
Other stuff I have that will be used as needed:
Basic graphics card, floppy drive (internal and USB), CD Drive, monitor, keyboard, etc.
I think I'll skip a network card for now since the motherboard is gigabit. But I can always add one if necessary.