I brought 2 Tyan servers from ebay
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260210191325 for $420US each $1400NZ landed.. they were brand new or hardly used!
They are of older generation but have great thruput, there are some great deals to be had..?. I prefer Opterons.?
then I got some more ram
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140215751383 $260Us $360NZ landed.
I retro-fitted 2 x 1Tb (32M)sata2 drives into the pci card area of the 2U case $NZ400each. I would use 750G for the other server as they are only $180each!
I installed SME7.3 and used software raid..HW raid is avaliable but for portability between other hardware, software raid is for me.
only one issue

I have with the tyan board is that the on-board 10/100 intel pro is detected by SME but doesn't seem to want to work!
I was hoping to Bond the 2 Gigabit on board LANS and use the 10/100 as the gateway port, but for now use one gigabit for lan, one for wan!
The LAN hardware tested OK, as I installed winxpro64 initially and that was going to run SME as VM with VirtualBox or vmware.
Because of how long windowsxp64 takes to install and the fact that it needs a large (basically re-install) service pack 2 before its any good!
Made me realize that SME is by far away the best OS! ever!

.
The Tyan MB is only sata1 but performance is great.

(hdparm -t gives 70MB/sec on the sata's and 82MB/sec on the 10K SCSI drives.)
The tyan has 8 scsi bays so upgrading might happen when scsi drives become cheaper??..Although It looks as if manufactures are phasing out Parallel scsi in favor of SAS (sata scsi)
The SME is installed on the sata drives, I mapped some ibays to one scsi drive and put the vmware files on the other..
backups are on a couple of external usb drives, the usb are version 1.1 but data backup at night with rsync is not a big deal!
SME 7.3 supports 8Gram thru PAE in the kernel...I didn't have to tell SME that it was there?
I have server2003 running AD and terminal server at moment, Have allocated 2 Vcpus and 2g ram to it
need to put some load on it to see performance/reliability??
I have the koha library vm running as well
cheers for now
