The build by gamer1357 is also great. But this one is my personal choice.
http://pcpartpicker.com/user/hitechashrut123/saved/kMQcCJ
Go with whichever you like.
Those are avg fps. That means there will be dips under 30 and I was not guessing at all before answering any question I personally do research about it.
Anyways for better playability 768p would be better for that card.
Well.. your cpu will slightly bottleneck your gpu. If you could overclock it then its ok , go for the R9 290. Otherwise start saving for a new processor as well to get the most out of your gpu.