http://pcpartpicker.com/p/zS9r
For the operating system u could boot it from usb thats what i did, since u pretty much dont need a optical drive anymore.
If u want u could add an ssd, this is almost the samesystem as i did build (very small changes) and it runs far cry 3 highest settings, u could switch case if u want to aswell.,
I got the Oc version of the Graphic card and diffrent RAM.
You dont need 650w with this build but if u some time want to upgrade videocard or something like that it is nice to have some room.