I do prefer it a little cooler for camping, but I agree that moving the rally into November would put us on standard time and it gets dark early. It's also nice to have it warm if you do get wet or muddy, as opposed to cold, wet and muddy. And speaking of wet, it tends to be more frequently gray, overcast, and damp during November.
Barring any major personal problems, I'll be there whenever it happens. I know I voiced my distaste for the warm muggy nights, but early to mid October is probably going to give us our best combination of weather and no conflict with holidays.