Rx 570 8gb nitro+ or rx 580 4gb aorus

[Uberdonger]

My pc specs will be:
1500x
b350m-k
8gb ddr4 hyperx @2666
500w raidmax-xt
wd blue 1tb 7200rpm

 

[Dark Lord of Tech]

Rx 570 8gb nitro+

And a PSU that is safe to run.

 

[Uberdonger]

Isn't the one i chosen good?Or maybe Litepower 550w?

 

[Dark Lord of Tech]

Corsair CX550M