Hey, I'm in the exact same situation. Going from an FX-60 to some quad core. I'm not really considering the i7's because I don't think they are worth it for the cost, but I am very interested in the performance and cost battle that may come up between Intel's non-i7 quads and the Phenom IIs. Still too early to tell though. Since its only the beginning of next year I'm just going to wait (though I am accumulating all of the other parts like case and PS already).
Lower timings means the RAM runs at lower latency, meaning it's faster than it's higher latency counterparts (good if you're looking to overclock your CPU). Lower voltage means it should be at the "standard" voltage specified for the RAM. It also means that there's more headroom for the RAM to be overclocked.
I have the exact same system as the poster and am thinking the exact same thing as the poster. I want to go back to Intel this time around. My COD 4 and other games need to be better.
I have done tons of reading as I am sure you have as well. I found the overclocker guys (not sure the name but they try to achieve the highest overclock) have taken the 965 i7 extreme to 5.5 stable. I hear the architecture might only last a year and that is if they are not impressed with the develpments. From the tests I have read on the 965 i7, they believe the chip & the architecture can really push some excellent marks.
I would like to wait, but the money might have to go something else if I don't settle soon.
I am doing small things like the other posters to prepare. NEW PSU, BFG 280 GTX OC2 - single card- SLI down the road. My Lian Li case will be sufficent and most of my other items are external USB or ESATA. I also have 2 WD raptors 150g I will keep an may do 2 Solid State Hard Drives for the Main OS. I usually run 4 Operating systems for different applications.