How much you think I can get for my system

Dante2013

Honorable
Oct 13, 2013
22
0
10,510
Asus Z77 Sabertooth
i5 2500k
coolermaster heatsink
8GB Corsair Vengeance
GTX 660 SLI
Corsair GS600 psu
Zalaman Z11 Plus

I got a lot of the parts pretty cheap. And in total this build cost me about 600 pound. You think I could get 700-800 pound for it? I see some PCs on ebay with 'nice features' but terrible motherboard or a terrible something else go for like 600 and shit lol.

I only ask as I want the 4670k with that msi gaming motherboard, and a R9 280x