I'd definitely go either r9 380 or r9 290. R9 290 is way better but takes a lot of power to run, and is older. I believe you can find them for $200 (181 Euro)
I also am a huge AMD fan, but I wish their CPU'S would come out soon. I'm going to make a build soon and I may have to go Intel. The FX processors are good, but Intel has better single core performance, and since games don't use all the cores, Intel is better. I hope games start using more cores, so AMD cards perform a lot better. They still preform pretty good though.