1stly 280x are no longer 300$ there now like 400-500$ so gtx better now. As well as 12 GB of RAM is hard cause you have to by like,3 x 4 GB of ram when it is easier to get 8 GB or 16 GB, and for the budget I would just stay at 8 GB then later buy 4 GB RAM later. If gaming 8 GB is all you need...