I still run an Core 2 Duo E8600... and I bought a GTX680 about 6 months ago.
While my CPU is a bottleneck for that video card... it's still plenty fast. A modern AMD CPU would be even less of a bottleneck... so, I think they are still a viable solution for gaming.
One just isn't going to get bragging rights in benchmarks... whooptie-doo.
That said... I personally would still choose Intel over AMD because they lost their way. In the Athlon era it was performance per clock... and they trounced the Pentium 4. Intel has reversed that with the Core 2 series and onward. Clock for Clock, Intel just wipes the floor with AMD.... and bang for buck wise, you are getting what you pay for. Even the cheaper Core i3's are kicking the shit out of AMD in many scenarios... that's just sad. So, I'm saying I'd go core i3 before I'd go AMD for a budget build... but I'll probably go core i5 on my next build (or whatever comes after Ivy Bridge)