i guess i am going to be the phenom guinea pig...*sniff*...ah well.
wooo man them things run hot (the 9850) supposedly...that was my main concern, but eh, i'll probably put it on water in the near future.
if you are going to be gaming for the most part, the 8400 wipes the floor with the 6600.
if you are going to be multi tasking a lot, the quad would be the obvious better choice.
you'd have to be multi tasking a lot for it to be, IMO.