The build in my sig does a pretty good job. You could upgrade the R9-290x to maybe the GTX 980 if you want more. Maybe go for a higher end PSU. Your choice of case of course.
dont waste the money on a 9590 i have an 8320 oc to 4.7 with room to go i actually got rid of the 9370 in favor of the 8320 but i would add a custom loop to that build Thaisnang i have my mobo cpu and 780s all on their own loop in that same case with the same mobo