Well I have a few questions, I'd buy it for my parents, but you wont accept Bitcoins for it? Why post it on a Bitcoin forum then?
Anyway, if I'm misinterpreting that, and you do accept Bitcoins, you just mean that you would like to pin the value to USD at time of sale I am indeed interested and have questions.
1) How old is the build, does it come with manufacturer warranty info
2) What company manufactured the GPU, like is it XFX?
3) Does it come with a PSU
4) would you sell it without HDD
5) Does it come with the drivers CDs?
Anyway, I'd be very interested in putting in an offer for it if a few things check out.