Hey, I must say go with Hertz, for super service, or go to any hole-in-the-wall rent-a-car for super savings.
Hertz once upgraded me to the next level of car for the whole 4 months i used it. And i paid only for a manual T.Echo!
The smaller guys will give you Lancer/Sunny/Corolla/Echo, but cheaper than at the big names. For the same rate at a branded rental, you could get a Mazda 6 or similar from a small agency.
IMHO, of course..
Enjoy