During the summer, I work on a bunch of pressure washers for a deck/sealcoat company and I usually see around 2500 to 3500psi. I used a 3500 on my car before and it was fine.
I would go with a Honda 3500psi pressure washer. Hondas run awesome and are easy to maintain. They cost more, but are worth it in the end.
Briggs usually runs at a lower psi setting. Also I have noticed with briggs is that sometimes they like to surge for a few minutes until they warm up.
Honda is your best bet