Hello I'm on a very tight budget ever since Sandy took out my house. My question is there is a I7 2600 WITH 550 TI , 8gb DDR ram with a z77 board on Craigslist. I went and check out the system and it seems to run beautiful with games. Btw I only play guild wars 2. He is asking 850 is that a fair price. I also think I can get it a hundred lower. I'm just a little nervous buying a used rig. Thank you