Just got a reply from the guy and it looks like a good offer. However some things are unclear and the GT is a GS, which it shouldn't be. Anyways he also made a second offer with a different processor and MB. It's a 'Mainboard MSI K8N Diamond Plus' with a 'AMD Dual-Core Processor Athlon 64 x2 4200+' for not a bad price.

I'll ask him aswell if the graphicscard is a 16 pipe and 256bit one.

I have sent a message back and await another answer from him.