Well when it comes to the AMD i can vouch for the 965BE. Its around £90 and has me maxing out games with my HD6970. It is a bottle neck and doesnt have the power of the i5's at all, it may have around the same power as a i3-2320 maybe, maybe. Still an all round CPU though. I play games, do 3D rendering and also render Videos.
2012-08-15 14:20:58 - MaxPayne3 - Vysnc Disabled
Frames: 13048
Time: 140386ms
Avg: 92.944
Min: 66
Max: 135
- Just Cause 2 - The Dark Tower - Vysnc off - x8 AA - Ultra
Frames: 6741
Time: 124629ms
Avg: 54.089
Min: 31
Max: 369
- Just Cause 2 - Desert Sunrise - Vysnc off - x8 AA - Ultra
Frames: 8564
Time: 118530ms
Avg: 72.252
Min: 50
Max: 526 (Sorry about this max on these two tests i was slow at ending them before the GUI came up)
2012-08-23 00:57:05 - Sleeping Dogs - Ultra High - No Vysnc - AA Extream
Frames: 3476
Time: 124005ms
Avg: 28.031
Min: 16
Max: 37
Total War: Shogun 2
Average FPS: 52.125
This is with a somewhat strong card though but at least it performs well. I think Intel is the better choice, if not for just sheer performance difference but its slightly more future proof.
The i3's also have Hyper threading and Turbo-Boost so thats a bonus. To add my sig says my new equipment. I jumped the gun a bit but everything's already been ordered so it 50% counts. so im still running this 965BE