The bad: AMD's NEW 8 core processors are almost on par with Intels Sandy bridge 2500k processors that came out 2 years ago.
The Good: AMD's affordable high end 990FX Chipset allows for x16 x16 crossfired cards.
The bad: Despite having more bandwidth in your lanes you'll still be achieving less fps generally than the intel rig.
The good: 990FX motherboards won't break the bank.
Some graphs and such: http://www.anandtech.com/show/6396/the-vishera-review-amd-fx8350-fx8320-fx6300-and-fx4300-tested/5
I prefer Intel these days cause my i3 at home blows away my AMD quad at work. After playing around with both I won't return to AMD anytime real soon. I used to be hardcore AMD for years. I still have my Barton 2500+ and a 939 around here. I just recently purchased a AMD card cause NVidia didn't impress me much this time around (I hate boost) and the new settings suck the fun out of overclocking for me and with AMD's loss of market share it scares me to know AMD could go under, competition is good and I will invest in that. If I didn't have a sandybridge 2500k waiting for me new box at a friends house I would consider picking up a FX8320 combo from Microcenter. They are pretty good deals if you don't mind the power consumption.
In the days of the Barton and P4 AMD was winning clock for clock, if they could do that again and cut their power usage I'd switch pretty fast.
My 2 cents.