Melbourne, FL (MLB) is slightly closer than Orlando (MCO), although your flight options to get there are considerably more limited (most of the flights in are via Atlanta). Sanford-Orlando (SFB) is north of the Orlando airport, but there are a few options there... mostly the tiny PanAm plus scheduled charters from Europe. Some folks have flown into Tampa (TPA) or Jacksonville (JAX) to get good fares on Southwest. Those airports are a couple hour's drive, but it's worthwhile sometimes if you get a great fare.