The title says it all. I have a guarenteed full size SUV from Enterprise and was just able to price the Exec Aisle at National for $402. I love the National convenience, but am wondering if its really worth the price difference and the risk of only having Impalas to chose from. Any thoughts? I'm tempted to leave the Enterprise ressie in place and if I don't like the aisle use it, but then would I get hit with a nasty cancel fee out of National? Not to mention that I'd have to trek back into the counter that I'm trying to avoid....TIA for any input.