brw...all the big 3 make a diesel. Ford, Chevy, and Dodge. I would recommend that you try them all out before you buy. I happen to be partial to the new 6.7L Ford, but do recommend you try them all. They are all close in tow capabilities, and all the engines are the best made yet (for each of them). It's going to come down to what you prefer for the creature comforts, and/or any loyalty you feel towards a particular brand.
I have the 2011 2WD F-250 diesel, and love it. It pulls my 5th wheel so easy, it is hard to describe sometimes. But I'm sure the Chevy and Dodge folks will tell you the same thing. Get out and try them all. That's the only way you'll know.
As far as 2 or 4 wheel drive, all three make both as well. As you noted, I have not needed 4 wheel drive yet. But I am still fairly limited in my ability to go very far. Mostly weekend type trips for me.
Ed and Sharon
2010 Wildcat 28RKBS
2011 Ford F-250 XLT, 6.7L PSD
Ride-Rite Airbags and Airlift wireless remote compressor...nice!
I thought I was wrong once, but I was wrong!