Rack Servers + More Valuation

Hi Folks,

I've been using a couple of servers as a render farm but have little use for them now and am considering selling but have no idea what to sell them at.

I've got:

Dell Poweredge 2900
Dell Poweredge 1950
Rack Cabinet
UPS
1U 15" monitor & keyboard
Windows Server 2003

Here are the details:

1 x PE 1950 XEON 5160 (3.0GHZ, 4MB, 1333MHZ)
1 x PE1950 PCIE RISER (2 SLOTS)
1 x EUROPEAN DOCS WITH RACK POWER CORD
1 x PE1950 BEZEL ASSEMBLY
1 x 2GB FB 667MHZ MEMORY (4X512MB SINGLE RAN
1 x SECOND PROCESSOR NOT INCLUDED
2 x 73GB SAS 15K 3.5" HD
1 x PE1950 3.5" HDD SUPPORT CHASSIS
1 x PERC 5/I, INTEGRATED CONTROLLER CARD (8
1 x 8X DVD-ROM DRIVE IDE
1 x REDUNDANT POWER SUPPLY NO POWER CORD
1 x RACK POWER DISTRIBUTION UNIT POWER CORD
1 x BROADCOM TCP/IP OFFLOAD ENGINE FUNCTIONA
1 x ENGLISH WINDOWS 2003 R2 STD SVR 5 CAL +
1 x PE1950 OPEN MANAGE FACTORY INSTALL DRIVE
1 x PES GOLD WARRANTY SUPPORT GUIDE
1 x UPG TO STANDARD GOLD 3Y 4HR PREMIER ENTE
1 x BASE WARRANTY
1 x 1YR BASIC NBD ONSITE
1 x SLIDING RAPID/VERSA RACK RAILS
1 x C3 MSS R1 INTEGRATED PERC5/I EXACTLY 2 D

1 x PE 2900 QUAD CORE XEON E5335 (2.0GHZ, 2X
1 x ENGLISH DOCS WITH RACK POWER CORD
1 x RACK BEZEL ASSEMBLY
1 x 4GB FB 667MHZ MEMORY (4X1GB DUAL RANK DI
1 x PE2900 ADDITIONAL QUAD-CORE XEON E5335 (
1 x 3.5 INCH 1.44MB FLOPPY DRIVE
2 x 73GB SAS (15, 000RPM) 3.5 INCH HARD DRIVE
3 x 146GB SAS (15, 000RPM) 3.5 INCH HARD DRIV
1 x PERC 5/I INTEGRATED RAID CONTROLLER CARD
1 x 16X DVD-ROM DRIVE IDE
3 x LTO3 TAPE CARTRIDGE 5-PACK DELL-BRANDED
1 x PV LTO-3-060 400GB INTERNAL 39320A SCSI
1 x REDUNDANT POWER SUPPLY (2 HOT PLUG PSU)
1 x BROADCOM TCP/IP OFFLOAD ENGINE FUNCTIONA
1 x MOUSE 2 BUTTON USB SCROLL OPTICAL
1 x UK/IRELAND (QWERTY) QUIETKEY USB BLACK K
1 x UPG TO SILVER 3Y (24X7) PREMIER ENTERPRI
1 x BASE WARRANTY(NA)
1 x 1YR BASIC NBD ONSITE(NA)
1 x CFI EMEA SERVICE. (SV-HI) OR POWEREDGE,
1 x RAID 1 / RAID 5 TWO CONTAINERS(G019K2)
1 x SLIDING VERSA/RAPID RACK RAILS
1 x C2 R0 PERC5I CONTROLLER MIN. 2 MAX. 8 DR

1 x SYMANTEC BACKUP EXEC 12.5 EMAIL SERVER S
1 x SYMANTEC BACKUP EXEC 12.5 SERVER SUITE
1 x SYMANTEC BACKUP EXEC 12.5 WINDOWS REMOTE
3 x WINDOWS 2003 ADDITIONAL 5 CAL - USER
1 x WINDOWS 2003 R2 SP2 STANDARD SERVER ENGL
1 x OPEN MANAGE SERVER SOFTWARE CD & DOCUMEN

1 x SERVER RACK CHASSIS

1 x RACK POWER DISTRIBUTION UNIT POWER CORD
1 x APC SMART 3000I UNINTERRUPTIBLE POWER SU

1 x 15" 1U RACK MONITOR & KEYBOARD WITH RAILS

I'd really appreciate some advice on selling all this in one go and what I could expect to get for it.

Thank you!

Nick