Honeymoon Plannin

OK so we have pretty much decided that a 7-10 day road trip is in order for the H-moon. Now to nail down a budget and a route! We really want to see the national parks out west but flights are a bit pricey when you add in a car rental and gas :( But the groom has already seen much of the East Coast and we don't want to repeat anything either. Grrr. Any suggestions??