I would hazard a guess that a c64 is alot better suited to this mini itx lark. Seeing as there has been some really nice mods done and the fact that CUSA (spit lol) has made their own remake which costs way too much!
I even have an old c64 breadbin here but it works so I wont be hacking that one up.
Price on the board? Mine was second hand and only cost me £25 but it came with a touchscreen lcd, gprs wireless, 40gb laptop drive and a pico-psu. The only thing I cannot confirm working is the touchscreen lcd. Just havent looked at it properly yet.