We love, love, love using
Alamo - they are onsite now at the airport and it is so easy. I usually pick up the luggage and put it on a cart while DH gets the car papers/check in and then we walk across the street and pick out our car. Then when we come back at the end of the trip, we drive in and drop off the car and get a luggage rack to take our packages to checkin. Very easy.
You can select any car you want that is in your "category". Alamo often has intermediate SUVs on "sale" even cheaper than the economy cars. If you have an AP, you can also get up to 20% off. They have never asked to see our AP's though...???
We have an intermediate SUV rented next month for two full weeks and are paying $218.00 with a $25 coupon (found on their website).
One nice thing about rental car rates is that you can go online and book them at no cost and then keep checking back. You can rebook and cancel at no cost over and over until you get the best rate you want. I've gone from $400+ down to $168 at times for trips, so it pays to keep checking.
Do check the discount codes at mousesavers.com. And if you have an AP, the Dis has that code listed. If your kids are in car seats, if they are FAA approved you can bring them on the plane for them to sit in and then just install them in the rental. If you prefer, you can also check the carseats at the airport and then put them in the car. You can also rent them along with the car, but we've found that DS prefers his own.
We've always gone with Alamo (9+ times), including when they were offsite, and have been very happy. I've looked at other rentals and either they have been more expensive or scary cheap and not reliably reviewed.
Good luck!!! Renting a car to have at WDW is excellent! You can get from place to place so much faster. We love eating at the resort restaurants and nothing beats hopping in the car and not worrying about switching buses or whatever.