Gears are a little bit of a mixed bag though. They help in first, but then you end up shifting sooner so there are always speeds where the lower ratio will have more torque. But my 5.7 with 4.10 gears still got 19-20 mpg on the highway so that didn't seem to be much of a disadvantage. I see a fair number of Ecodiesels with 3.92 gears but very few Hemis.
I was leaning towards the 2500 because of the low payload capacity of the 1500, and it's easy to find a 2500 with trailering equipment, but I think I'll stick with the 1500 after all (the 8-speed, even though they charge a huge premium over the 6-speed), or another brand.