Case: NZXT Phantom 410

Motherboard: M5A97 R2.0

CPU: AMD FX(tm)-6350 Six-Core Processor

GPU: NVIDIA GeForce GTX 750

PSU: Ultra LSP650

I have an SSD and a 1TB storage drive.

Ram: http://www.amazon.com/Kingston-HX321...in%3A677427011

In other words i have 8GBs of ram.

Alright so i would like to upgrade something in my pc but im not sure what to upgrade? Any tips on what and why to upgrade a part and if i upgrade a part will i need to upgrade my PSU?
Would an after market CPU cooler help? I dont overclock btw. I Have about 4 fans including my cpu cooler in my pc so would buying some more fans help?