A good rig
the Radeon HD 7950 Boost Edition graphics card, is about just as much as the 660 TI, and has a little more power behind it.
So i guess it comes down to what deal you can get for the parts.
keep in mind though, that Intel's Haswell CPUs are coming out this month, which will either be an improvement over the existing Ivy Bridge CPUs, or at least decrease the price existing Ivy Bridge processors
So if you can wait a few weeks, your cpu choice may be a few dollars less expensive