Can someone help me choose?

What about the fact that it's an older card? Should i be worried in terms of features/drivers in the future? I haven't chose my PSU yet because, i needed to know which GPU i'm going to buy so i can calculate the wattage. I was thinking about an Cooler Master idk. Any suggestions about the PSU?
 


No, nothing to worry about, the R9 390 is in fact the same GPU as the R9 290, just rebranded and with more vram (which unless you are playing at very high resolution doesnt matter).

I would go for a good 600w unit from a make like XFX, Seasonic, Superflower, EVGA G2 etc.