This system was about $399 at MicroCenter and it works well. I had to fiddle with the SATA RAID drivers at installation, but so far so good. All other drivers were supported out of the box.
3.00 gigahertz Intel Pentium 4
16 kilobyte primary memory cache
2048 kilobyte secondary memory cache
Board: ELITEGROUP COMPUTER SYSTEM CO.,LTD. 945G-M3
Bus Clock: 200 megahertz
BIOS: Phoenix Technologies, LTD 6.00 PG 12/19/2006
SONY DVD RW AW-Q170A ATA Device [CD-ROM drive]
WDC WD1600JS-22NCB1 [Hard drive] (160.04 GB) -- drive 0
Board: ELITEGROUP COMPUTER SYSTEM CO.,LTD. 945G-M3
Bus Clock: 200 megahertz
BIOS: Phoenix Technologies, LTD 6.00 PG 12/19/2006
1016 Megabytes Installed Memory
ATA Channel 0 [Controller]
Intel(R) 82801G (ICH7 Family) Ultra ATA Storage Controllers - 27DF
Intel(R) 82801GR/GH SATA RAID Controller
Microsoft iSCSI Initiator
Intel(R) 82945G Express Chipset Family [Display adapter]
Samsung SyncMaster 530/531TFT (LXB550*) [Monitor] (14.9"vis, October 2002)
Realtek RTL8139/810x Family Fast Ethernet NIC