I am a big fan of the condos at Cassine Station. These were built in 2006 - everything is brand new and top notch. The condos are on the north side of 30-A right across from One Seagrove Place. These condos are not gulf front - just walk across the street directly to the beach. There is very little traffic in October, and we had no trouble controlling our four hyper kids across the street multiple times. There is a community pool right across the condo parking lot and another in the subdivision.
Here are a couple of links to places I have stayed...
http://www.vrbo.com/101158 - 2 br/ 2 ba + bunk room; sleeps 8; about 1350 sq. ft. Bonnie is the owner and I think she is renting at $150/day after 8/4. (I think she is also doing a "stay 4 nights, get 5th free" deal after 10/1.)
http://www.vrbo.com/87176 - 1 br/ 1.5 ba + hall bunks; sleeps 6; about 730 sq. ft. Hannah is the owner and I think she is renting at $115/day after 8/7.
Both of these condos are awesome! If you contact them, let them know that John LeBoeuf sent you. (Maybe I'll get a fruit basket or something out of it!!!)
Good luck!