On a 500$ budget thats easy
semperon cpu 35 (Best mining cpu)
pos case 25 (buy any atx case)
hd 7850 200 (GPU)
PSU 7150 (750 watt)
hard drive (sata) 25 (any mem works)
ram 50 (4 gigs)
mobo 75 (am3+ slot)
MIND YOU YOU WOULD NEED TO USE LINUX
AND IT would need to be wired in, not wirless
also if you would want to expand you would need a new gpu
OR buy a rig from me. Ill build one custom tailored for you with al mining software loaded up and ready.
We can work out price pm me.
I've just been doing a bit of research on GPUs and came to the same conclusion, that the 7850 gives the best bang for the buck, when you include power draw. What makes the Sempron the best CPU? Just because it's got a low power draw?