tdinut, have you purchased yet?
Here's My . 02...
I'm not going to tell you what I think you should do, but I'll tell you what I did.
I've owned four Dodge/Cummins, the first two were a 2000 and 2001, both 2500 4x4's, the '04 and the current 2010 was/is 3500 Dually 4x4's. I, too love the diesel, the sound, torque, etc. I personally HATE the mileage, and therefore have really hated the daily drive to work. I was tired of driving the '04 and trying to park it at work. Small spaces and the 6-speed made it just a little more of a nuisance. So, I got a 1500. First one was a RAM 1500 HEMI, loved it. Hated the 20" wheels, 'cause I could buy 5 new 17 inch rims and tires for less than 4 new 20" tires. Anyways. Due to an accident in another vehicle and my wife needing to get a new one, I traded that truck in on a car for her. Wish I still had that truck, tho. Anyways, then I was in the same boat as before... driving my dually to work... so, looked at a Dodge and GMC, GMC 1500 5. 3L 4x4, nice truck, dealer gave me a better deal at the time, so that's what I got. Recently sold it and the '04 and got the '10. It's an auto, and my wife can take turns driving it on long trips, and can drive the boat trailer out of the water now. The GMC just wasn't too good at pulling the boat, due to where the power was and the engine screaming in 2nd gear.
Over the last 4 weeks, I've driven a 2010 Ford F-150 Lariat, a new GMC SLT with 5. 3L, and the six speed auto which supposedly helps it get better mileage and better for towing. And I drove a new 1500 Ram Hemi Laramie. All nice trucks, supposedly get 18-19 mpg on the road (the GMC says 21 mpg in a 4x4 with 5. 3L six speed. ) The only real thing I hated about the Ford Lariat and the Dodge Laramie are the console shifters. Hate it. I want the shifter on the column on a truck, where it belongs. Console shifters are for cars. That's just me. These are all nice trucks, and I would have gotten whichever gave me the best deal. Finances, however, dictated that I can't afford two trucks right now, so I looked at something cheaper. I also drove a new Camaro, Challenger, Mustang, and the new VW TDI, boththe Golf and the Jetta Sportwagen. Since I still need the big truck to tow the boat and large enclosed trailer, I wasn't going to part with it. I could've sold it and got the 1500, but it just wouldn't be fun towing very far. Wish I had a new 1500 and my old '04 back. Anyone have a black, 04-05, dually, six speed 4x4 Cummins?

Both the '11 Ford and Dodge can be had with a 32 gallon tank, so that's a plus. And I'll point out that a 2500 short bed is going to get a little better mileage than my 4x4 dually crew cab due to weight and less rubber on the road.
I ended up with a 2011 VW golf TDI 6-speed auto. 42 mpg, lots of zip. And it's easy to park!

Only regret is I wish I would have got a black Jetta Sportwagen instead.
SOLER