I plan on buying a GTX 680 sometime soon for my gaming rig (it sucks, it has a gt 610). I also plan on getting a 750 watt PSU before I get the gpu (I have 350). I'v found a couple of these cards for about 2$89 on ebay from people with really good feedback. I will just about never have enough to get the card full retail (I'm only 14 living with my parents of course). So is it a good idea?