Holy shit, someone selling computer parts on the Internet with prices that are actually reasonable and well within a fair range comparing market value with the used value.
Also:
4GB (2x4GB) G.Skill RAM
This is a typo. Either you have 8GB total RAM or you have 2x2GB individually. 2x4GB doesn't equal 4GB.
I just got an old XP-running tower for free the other day that I've already considered ripping apart and rebuilding, so I do have a bit of interest here. However, my funds aren't where they would need to be for me to have excess cash to blow, or I'd just buy the lot upfront.
I'll be keeping an eye out, but don't hold your breath on me confirming a buy.