You could do a 3* Priceline bid in the MCO area...frequently the Hyatt comes up that way for $40/night or less....even if you don't get the Hyatt you would get either the HI Select, Marriott or Renaissance (very rarely the Sheraton Suites or Crowne Plaza come up in that category also)....all are nice and have complimentary shuttles that run 24/7. We got the Hyatt in the airport for $38/night for our late arrival night in April.
I honestly don't think being in the airport vs.one of the off site places is any advantage. We have found the rooms to be larger at all of the off site Priceline 3* places, the shuttle service has always been prompt (you call for the shuttle from the courtesy phones in baggage claim and they tell you where to meet them and they arrive by the time you get there and it is a 2 minute drive to the hotel front door), then you can hop back on the shuttle the next AM and they run you back to whatever drop off you want...no hassle. The Hyatt has a psychological advantage (it is really nice to think about grabbing your bags and going straight to your room), but the reality is, we always seem to have flights that land in the other terminal, so it is quite a hike back to the hotel desk, and takes every bit as long as hopping the shuttle to one of the off site places...either way it is one of Pricelines best bargains for $40/night or less.