I need an upgrade guide & if applicable I need a higher end PSU that would be the same size fit & cable connectors as from some of their higher end models uses same size PSU, I just wanna be sure that it should work & as far as specs go I'm rocking the

Processor: i5 7500

RAM: 32GB 8+8+16

R7 250 Graphics

stock 256GB NVme & 500GB Seagate Baricuda HDD

Drivers are up to date. Only issue now is just finding upgrades for Power Supply & Graphics upgrade