I really like the looks of the 05-07 Fords on the exterior. Very nice looking truck.
However, seems like everyone has problems with the 6.0. I would personally stay away. Seems like their are injector issues, wiring issues, major turbo problems, major head gasket problems and not the best fuel mileage. Lets not forget how much Ford payed out in warranty claims. Which is the main reason for the splitting of Ford and Navistar in the future.
The 7.3 is much more reliable, but less powerfull.
IF I WAS DIE HARD FORD, I would only have two options, a 99-03 7.3 or 05-07 Ford with a Cummins in it!
V-10 is reliable, but eats fuel. Haven't been in a 3 valve to comment on power, but I personally think the 6.0 GM has more power then the 2 valve V10.
Personally, I think the 8.1 GM is a lot better choice. More low end torque and pulling power.
I personally think the Duramax or Cummins is a better choice in the diesel department.
I would probably avoid the 04.5 or 05 Duramax LLY but the 01-04s are good. 06 and 07s are good but not as good of mileage, and a few more issues.
Any 03-07 Cummins is a good truck. Love my 03.
I really don't think the interior on the 05 Ford is any nicer then my 03 Dodge Laramie. Just my opinion. My buddy has an 05 Lariat and I really don't think their is much difference. Seats seem similar and everything is similar. Ford has the digital climate control which I don't care about. I think the white face Dodge Gauges are nicer, and real numbers are better then High and Low.
I like the GM interiors too, but I don't think they are as nice as the 03 up Dodge or 05 up Ford. I had an 04 GMC and like the 03 Dodge better.
I really dislike the 99-04 Ford interior myself.