The performance difference between those two won't be visible, probably. So, check the price of a complete system (CPU, DRAM, Motherboard).
The AMD product runs virtually full speed with DDR2 memory which can make a difference price wise. And newer AMD CPUs are usually plug compatible with older motherboards which might save some money later on. A 790GX north bridge and SB750 south bridge AMD mother board would be a good choice with AMD.
Still, prices and specials seem to vary monthly. So, today's best priced system may not be tomorrows. I try to check on the day I order. Better yet, I order over a period of time shopping sales to try and get near the best prices.
I notice the 3.4GHz AMD 965 is $215 today and the 2.66GHz Intel i5 750 is $200 today. The i5 is not an i7 so the GHz difference means a bit more. When the i5 came out, the 965 was slightly overpriced at $245. AMD fixed that. Competition is good
Anyhow, find the best deal and put the money you save into the GPU for the best gaming system.
Just opinions FWIW.