I went with Dodge, and have been very happy. Turbo Cummins, 4x4 long bed extra cab auto. So far(15,000miles) it has been perfect. It handles well, the power is excellent, and the ergonomics of the truck are great. I've had limited towing, my
B8200, and concrete trailers. It did both easily.
Right after I got my truck, two trucks came into the shop for oil change(My Dad works at a Dodge shop in Sacramento, Ca). One truck, a '98, had just turned over 700,000 miles, with only regular maintanace. The other, a '97, had just turned over 500,000 miles, with only regular maintanance required. Both were business/work trucks.
A couple of other folks mentioned some time ago, the Dodge has a good motor, but that's it. My expierience has been they are great trucks.
I also drive a Ford F450 flatbed at work sometimes. It has the 6 speed/diesel. It has been a great truck so far, but I find the in-cab ergonomics of the Dodge more comfortable.
The new Chevy has a lot of potential. Izuzu has a history of making pretty good engines. The biggest thing they have going for them though is the Allison tranny. The Dodge can make incredible power, but the auto can't handle it. The Ford can make good power too, but not through the Auto.
I'll stick with my Dodge. At least for ten years or so.... It's hard to go wrong with any of them though; the playing field is pretty level; it mostly comes down to personal preference, ergonomics, ect.