For $220 you can get 2 options. R9 270X (or non x version) or the GTX 760 which is $20 more.
But I recommend getting the 270 (non x version) because its exactly the same as 270x just clocked lower, but you can always buy good brands like MSI or Asus and overclocked the heck out of it.
I have an Asus DCII R9 270. Base clock 950, overclocked to 1170 mhz and still stable. That gives you like 10% more performance. So if you want you can spend more on 270x, but it makes no difference in performance.
Of course with that being said, if 270X is cheap buy it, if not don't.