If your going to spend the money, You should look at gears. . Most HDTs are geared to pull 80k pounds. Our trucks just don't carry that much. Upping the HP will make the engine work a little easier but it takes fuel to make HP.
Find out what RPM peak torque on your engine is and gear your truck to run that at your desired cruising speed You might have to downshift a little earlier on the hills but it will make your life a lot easier.
Rather than comparing engines/tuners/and such, compare top gear ratio/final drive/tire size. Speed is a factor in either case.
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