Another vote for a Cummins Dodge. There not so big once u get driving one everyday. I drive a 3500 dually and I whip it around like a sports car somtimes, lol. I average 19mpg city with all my mods, and best was 21 before I started adding power (my chevy 350 got 12mpg empty, and had no power to tow). Haven't done highway since I do all my driving in or around the city. Power is amazing, and I have the smallest pumped 12v. I have the 160 pump so If we can talk you into a cummins get a 215 pump 12v (1996-1998 5spd) since they get alot more powerful with free mods. I figure i'm making 260hp and 660tq or so on free mods, and haven't even upgraded injectors, turbo or any major pump mods.
And plus with a rebuild rate of 500k miles, there built to last. And theres plenty out there with a million miles and going strong.
Or you could get a smaller truck or older vehicle and swap in a 4bt cummins, that would be cool.