nakman, thanks for the welcome and advice! I would totally be open to a '03+ LC without nav, but I know they're rare as hen's teeth.
Point taken about the 5 speed... I'm coming from a twin turbo V8 and a supercharged V8, respectively, so I realize these trucks are going to be dog slow no matter what and the 5 speed would definitely help a little bit. :P Am thinking I may even go to Slee and inquire about their turbo kit once I find the right truck.