i don't like using a 3rd party because i like to know that the pick up location is in the airport, you can't guarantee that if you don't know the company. that's just my personal preference. my time getting out of the airport and to the World is important to me, it may not be as important to others.
right now there are really NO good prices on cars, i was shocked at what i am paying compared to last time i went 5 months ago
my best recommendation is to visit mousesavers.com. and try national. i like to book through national for 2 reasons. first, you can join the emerald club through mousesavers for free and then only have to rent an intermediate and you can get a minivan from the emerald club aisle (you know, chose any car in the aisle commercial? it's real and it works and orlando has rows full of minivans). and second because if you do reserve as an emerald club member there is no paperwork to get the car. you literally do just walk out of the airport to the national area in the garage- it is VERY close to exit- get in a minivan and drive off. they scan the car at exit and you're off
also, once you join emerald club, try all the different coupon codes on mousesavers, i got my minivan for this month for $100 less than before i put the coupon code in