LegendaryPow :
http://nz.pcpartpicker.com/p/x9kYJx
Well this is what I made, I'm pretty sure I have everything else.
Well correct me if i am wrong why on earth you want to spend more on chassis than cpu itself.If you have 175 $ to spend on chassis spend it on gpu.Look here are some variations you can approach
If you want to use a dedicated gpu better use a scratch build and if you can bear the price of one more chassis and HDD you can get two system and you can even resale one(though pc on resale go on really low price) or give to someone if you have i dont know kids or something.
Build everything from scratch and put 8gb ram from your earlier build inside new one,Then you can give the old one to somebody,sell it or keep it for yourself your choice.Basically APU+GPU doesnot practically improves any significant graphic performance.
So,Here it a combo i suggest for the rig you are going if you plan to use that mobo you need athlon it wont be good as fx 6300 and on cpu side it will be similar to what you have now you dont have to use a seperate mobo then, only buy a new 500w psu,graphic card and aftermarket cooler if you have a cheap level chassis.But atleast 750 ti 2GB ddr5 or Sapphire R9 270x if you want to spend some good money not a 175 dollar new chassis