Oh come on, the OP is coming from an Nvidia gtx 260 according to his profile so this is all an improvement, and his 750W PSU can drive a pair of 290's in crossfire.
The R9 285 only pulls about 35W more than a GTX 960 during gaming, which I really can't get excited about. I also can't get excited about the roughly 6% faster you get from a gtx 960 over a gtx760 for a similar power difference of around 30W. I can get excited about saving £50 off the retail price of a 960. I am absolutely the target market for the 960, and yet last month it was the first time in a string of Nvidia cards since the 4200ti that I didn't buy Nvidia for my own machine because their value for money didn't add up. I can see why people would buy the GTX 970, but I personally wonder why anyone would consider the 960 outside of very small ITX builds where every watt counts.