i have a r9 290x with a fx 4130 (125w) on a 550w psu so dont wory but get the amd 8 core cpus with a cheap motherbord and cheper memoryand spend and if you have some more money get a beter gpu
If this is just going to be a gaming / web browsing / media consumption rig you could save some cash on the CPU to put towards a better GPU by going with the Intel Anniversary Edition CPU and a cheap motherboard costing less than the AMD CPU alone. Overclock the Intel and be good to go for gaming and still fine on the PSU.
http://www.microcenter.com/site/brands/G3258Bundle.aspx $100 for CPU / mobo combo.