I'd recommend that if you are willing to go with Team Red (Being a fanboy helps no-one) you buy a R9 290. I found a great deal:http://tinyurl.com/lpxb7xq
It's a Gigabyte card, and they have an excellent cooler. Also it has great overclocking potential if your into that kinda thing.
Here's how they stack against one another:http://gpuboss.com/gpus/Radeon-R9-290-vs-GeForce-GTX-770