from your choices, i would have to say NONE of the above
you start with F150, so all the trucks must be 1/2 ton........
I choose to keep the 6 year old 1 ton I am most often using, ftw,
because I would not be able to put 2 tons of rock salt in the salter thats
goes on the rear in the winter.
preference between them otherwise?? I have not looked at the 2006 trucks,
so I have no choices today.
At my work they did order some new 1 ton Ford diesel
and 3/4 ton Chevy multi fuel trucks. {Gasoline, and either propane or cng or methanol blend, not sure which alternative fuel they will be yet}