Id avoid an '04-'05 because they have some issues that the '06-'08’s dont, mainly cam phaser issues.
Finding a supercrew with under 100k for under $10k around here is gonna be tough. It seems like truck values went way up in the past few years.
Dont let a one time spark plug change scare you away. Sure its a bit expensive but its a one time deal since they only need changing every 100k.
Ive had a few minor issues with my truck but nothing too serious and its at almost 108k right now, about 60k of my driving. Otherwise just an airbag sensor, turn signal switch and reverse/parking sensors. No motor or transmission work has been needed and all the suspension parts are original too.
The rearend bearings went bad but that was most likely due to a fuck up by the guy I had replace a leaking pinion seal.
The brakes on my truck seem ok. I havent changed the front pads and rotors since Ive owned it and I replaced the rears about a year and a half ago.