How much are my two N forece 2 Computers (Athlon XP) Worth?

[FormatC]

I have 2 old Nforce 2 computers I want to sell on Ebay to up grade to Athlon 64 and I want to get a general idea of what their worth before I sell them These are not complete systems as I'm keeping my hard drives and optical drives and cases and other misc parts

System 1 Was my HTPC
A7N8X-E Deluxe
CPU AMD Athlon XP 2600+ Comes with a HSF
512MB Ram PC 3200
Saphire ATI 9600XT

System 2 Was My Main System
Asus A7N8X Deluxe Rev 2
CPU AMD Athlon XP 2700+ Retail
512MB Ram 256MB x2 Micron Runnig in Dual Channel
ATI Radeon 9600XT 128MB DDR AGP 8X Graphics Card

I Might Sell an Antec 400 Watt Power Supply with either package I think in a PP-402X a nice older supply that I had to replace the fan in reciently and no P4 connector

Thanks