Another option is Dell.
We've just bought a bunch of their 2450 Poweredge servers.
These can be ordered with RedHat 6.2 pre-installed. The
configuration we ordered has dual 350-watt power supplies, a
733 MHz PIII (dual processor capable), 133 MHz bus, 512 MB
RAM, an integrated Ultra3 SCSI RAID controller with 64 MB cache
and 2 18 GB 10k Ultra3 drives. This is in a 2U case. It has room
for 4 hot swap drives, a CDROM, floppy and one open bay for a
tape drive. Cost is about $7000. This includes the rack mounting
hardware and 3 years of next day on-site service if something
fails.
