With the consoles looming system requirements have expectedly gone up. On the Intel side I am seeing the i7 in the case of Intel or 8350 in the case of AMD pop up a lot. An i5 or 8320 should still be adequate in most cases.
I currently have the AMD FX 8320 paired with a Geforce 660 which seems to just about match the recommended specs for upcoming titles like Watchdog.
Both the 270 and the 760 are good cards but the 760 is ever so slightly faster in most titles. Several developers have signed up for Mantle and with the new consoles all running AMD hardware this may change but at the moment the 760 appears to be the better card for the money.