Currently looking at this question with a 28 BHBE. I've decided to stay with my F150. If you are looking to update anyway, I'd go with a 3/4 ton. I think a gasser or diesel is your preference, but for payload the 3/4 ton is huge. I don't know your specs, but a 1/2 ton will give you plenty of towing, it is just payload that I think may become a problem for most people.
2015 Ram 2500 Laramie, MegaCab, 6.4 Hemi with 4.10
2015 Jayflight 28 BHBE
Equalizer 14,000 lb hitch with 12,000 lb ball and arms