This ore built ticks all the boxes for me. Also gonna get an ssd for it, a
Should I replace the psu or should I keep it (will replace with a corsair cx600) if necessary.
What PC? You forgot to post the link.
Also, the Corsair CX units are bad quality, look for XFX, Seasonic, or Corsair (TX, HX, and AX series only) units.