I have not started I have not started yet on the built so far this is all I have
Cpu - amd fx 6300
Motherboard - asus M5a97 R2.0
HD - western Digital 1TB black
GPU - R9 270x DirectCU ll
Corsair obsidian 450D mid tower case
G . Skill ripjaws series
PSU - corsair cx750
CPU cooler - ?????????? Don't now.
SSD - Don't now . ?????
Budget I am on is between $800 - $900
1) get closed loop cooling like corsair h60 since this build is not powerfull.(h60 will take you long way)
2) 280x will be much better for gpu or used 290x
3) Its a nice case.
4) Get Mushkin SSD
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226576
and thats about it.
As posted above IMO you probably don't want to go lower than a R9 280. Been helping with builds for years and the 270s are not quite enough anymore if you plan on not upgrading for a few years. The 270's are great cards but it's around $20 more for a 280 and that extra GB of ram is getting more and more noticeable.
But if you already have those parts sell the cpu motherboard and gpu and you should be able to have enough money for this. http://pcpartpicker.com/p/jgjNFT
What about I put in a gigabyte geforce gtx970 windforce 3x
Been off a few days but that would be a good bit better than the 270x.