In case anyone else is interested...
National in Orlando is pretty much all GM product, pretty much the prototypical choices. Compacts were Cavaliers, Cobalts, and Sunfires, the intermediates were Malibus if you are regular, some G6s if you were Emerald. Or, as in my case, they were out of cars in the line amd you asked if you could take one the G6's. Most of their other locations are pretty varied in their selection, not here. Although the Minivans looked like they had a few more choices available.
Oh, one other great thing with National - with a copy of your itinerary, you can use a debit card for the rental. And, they did not pre-auth a large amount on it, either!