we usually book via noachcars, they usually have rates below what you see if you went onto say Hertzs site or the likes of a Priceline.
You probably wont get a newish car but youd be better off as an older car is banged up or has issues with the body so should another occur they wont beable to know scrape wise that is.
1 positive thing to not going with Hertz is if you checked bags then the shuttle drops you off right in front of the doors to the Departure Level, with HZ you hav eto drag your bags across the roadway or up the El to another El. Also HZ is charging $50 for the airport tax the others alittle less
at least this is what we went thru last time there this past March