To repeat others, we have always used dollar or national (both located at the terminal) and have always had great experiences with both. You can't go wrong with either. Actually National is having some of the lowest rates I've seen in a long time. Mousesavers.com has some great codes to use to get even more off of your price. But even the base price is low. Neither of these companies require a credit card to hold your reservation, so you can even switch back and forth as many of us do, as the rates change often. Bottom line!!! If you see a rate you like, BOOK it now, because it may not be there next time. Also, always check the next size larger, because sometimes it's only a couple of dollars to go up. AND last, always check both the transportation and budget boards, because when there's a deal, you'll probably read about it on one of these boards!