Ok I have suggestions for the parts.
CPU - i5 3570K
GPU - Radeon hd 7870
Mobo - Any z77 motherboard is good
Ram is fine.
1Tb hdd is fine. But also get a 60-120 gb SSD
PSU - Getting a modular PSU is better but it is not necessary. Also any PSU 500 watts and higher is good for your situation.
Hope this helped!