We chose November for a couple reasons - we got engaged in December and we wouldnt be able to plan it quick enough for spring 09 and I didn't want to wait until Spring'10. Plus, we both live away from home and we figured if we got married in November, we could have our AHR in December when we are home for Christmas!
We have had lots of people ask "why November" too - I think because when people think of heading down south, they often think of going in spring.