Check if he has registered the card on the XFX website. If he has, then the lifetime warranty will carry over to your card, courtesy of XFX's Double Lifetime Warranty.
But overall, looks like a great price, if indeed everything is working perfectly.
Just for comparison that mobo on eBay goes for around $50.00, give or take $10 on the average. I have that AMD X2 3800+ cpu and it is very steady. Since it is socket 939 getting cpu upgrades is nigh impossible except for places like eBay.
Depending on what you want to use the computer for you could make yourself a nice little rig.