Hertz is always my first choice, however, the last 4 rentals i had to book with Avis or National.
This PC coupons never work well for me. Last time I wanted to book 3 days in DEN using a one day free coupon. The cheapest price with Hertz (including coupon) was $128 or so. Ended up with National for $88!
Got a nice, clean, almost new Mitsubishi Diamante...have Emerald... take any car under the canopy....