I was in your situation and decided to buy a new (in 2014) SLT 6.4/3.73 instead of ordering the same truck with the 4.10.
We tow a 7,500 pound travel trailer and, regardless what people say on this forum, I KNOW we are not going to buy a bigger trailer in the near future. The same people said "don't buy new," and we love our trailer and don't want to "upgrade."
We have taken this combination through the Smoky Mountains and the Ozark Mountains, and been more than happy. Granted, those aren't the Rockies, but I knew we weren't EVER going to go through the Rockies with this truck and trailer.
I paid $34K for the truck in my signature. An SLT, 4x4, 6.4 HEMI.
Buy what you want. It's your money. As for my money, I will buy what is the best deal for my needs, and the 3.73 gears with the 6.4 is more than adequate. I really just love the extra payload with the gas 2500.
