Good pc for under $1100 gaming? what parts

I am looking for a pc that could play skyrim at least 60 frames with about 500+ mods I'm currently running a gtx 660 with a i3 2130 dual core and its not cutting it If someone could recommend a part or a few parts to do this with I would be grateful. BOOM

Low performing power supply.  That model experiences a lot of voltage drooping.

Switched some parts around to make it cheaper.