Case....mid tower
Psu...use the old unit.
Mobo...atx size.
Ram...2x4GB@1600.
Gpu...use the old unit.
Cpu...some top of the line I5.
Disk.....your choice.
Disc....some dvd r/w unit.
Os....your choice.
Total up the bucks and check your budget.
I have 800$, a 600 watt psu, and a gtx 760. What is the best computer i can make(i am open to ditching the psu and the gpu)

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic