you should get ahold of jason at three palms properties. he has more long term rentals than anyone ive found. I just moved down beginning of Jan. let him know AC sent you, hes very informative and on top of stuff.
http://threepalmsproperties.net/contact/ - go there and fill out your info and he will get you an updated list of available places.
just tell him what you are looking for, enjoy!
AC