I'm w/ everyone else on the Crew Cab. It'll be worth it in the long run.
As for the gears. I don't think everyone is taking into consideration that you are going to lift it and put bigger tires on it. If you will be towing a lot of heavy loads, the 4:56 would definetely be the way to go. IMO
If you stay w/ stock height and tires go w/ 4:10.
If you buy it and don't like it, let me know. I'll come take it off your hands.
Oh yeah, get the LT package too. Only way to go.