Assuming it all works, with keyboard and monitor included, I'd say it's worth $125. I'd ask for the OS media as well because if it's an OEM version of Windows 7 (pre-built from MicroCenter, I would expect it is), you won't be downloading an ISO from Microsoft Recovery.
The SSD is all but useless. The OS, currently installed on the C: Drive exceeds the size of the SSD D: drive.
The GT 640 can't really be described as a gaming card, but given the monitor resolution of 1440x900, it should be ok for modest games.
With a Intel Core2Quad Q8300, I suspect you're looking at a socket 775 motherboard with 4GB of DDR2 RAM. Speed being either 667 or 800mhz I would guess.
BTW, you're up in my neck of the woods. I'm over in West St. Paul.
-Wolf sends