I always say this to everyone though - I would either go with the R9 270 for a little less money, or the GTX 760 for a little more.
The reason I suggest the R9-270 is because it is a 270x just with lower clock speeds out of the box. But every reviewer consistently points out that the card can easily overclock and surpass the stock 270x and even match an overclocked 270x. So if you can save money by getting the 270 I'd say do it!
EDIT: I had a look at the site that you use to shop for your PC components and I noticed the R9 270x you chose was cheaper than all others - even cheaper than the 270. So good choice!