I use Alamo at MCO 2-3 times a year. Each time I go I book a standard car and then negotiate at the counter when I want something bigger. In September I managed to bag myself a Lincoln Navigator which on top of standard car price was an extra $50 a day.
I was there in January and booked standard car. I wanted to try the BMW 6 series gran coupe but they wanted $100 a day extra. I got them down to $40 a day on top of standard car deal.
So haggle at the counter!!!