If going with a gas motor, regardless of brand I'd pick 1-ton. 1-tons will ride a little stiffer due to having a stiffer spring pack. In some cases, you may get an upgraded axle as well. But in Ford's case, I believe the only real differences are the spring pack and the door jam sticker. I decided to just get a 1-ton and be done with the upgrading game. In the state I live in, there's no real insurance difference between a 3/4 and 1-ton pickup. There's also no difference in registration of the vehicles either. Make sure you call-up your insurance agent or do an online quote for a 3/4 and 1-ton vehicle to see if it'll negatively affect your rates. Interestingly, my insurance only went up 10 bux every 6 months when I bought my 1-ton. This is switching from a 2010 F-150. The raison de etre' for the 3/4 ton truck was primarily for insurance or registration issues in many of the states. So do a little more homework before making a final choice!
Now as for which gasser to get, have you looked into the upcoming 2014 gassers from GM and Dodge? The new 6.4 liter HEMI is going to be a monster looking at its power curve. It really puts down the power early and has a broad torque curve from what I've seen. The new GM motor isn't going to be a slouch either. I'm sure Ford will wring more power out of the 6.2 to remain competitive but that new 6.4 is awesome. It's also the only gas motor to have a twin alternator option as well in case you need to have more power draw for accessories and such. However I'm unsure if that twin alternator option will be on regular pickups or C&C only.