A Dell, Compaq or IBM server with similar features can be bought for $350 or less on eBay.
Really? I would expect more than that. None of the servers I have seen on Ebay for less than $500 are really even comparable.
In fact, most of the comparable ones that I see are above $700. (And that is just for the server, not including an 11U cabinet like I have) Which usually come with 1-3 SAS 73GB hard drives. (Can be purchased for a whole $19 each off ebay)
Just the RAM by itself sells for no less than $125 and the Hard Drive picks up another $100 by itself on Ebay.
Your best option to recoup money would be to part it out. And sell it as pieces.
Parts are worth more than the complete build.
It is the nature of technology.
My first wireless system ,A whopping 1 mbps system was $5000.00 with 2 exterior antennae. Worth a whole $20.00 today as a used kit .