I'm a Moderator of a CB forum and most of us use a Wilson 5000 or a K40 . But i use a K40 mounted on a home made L Braket mounted to my truck tool box . Most of the guy's i talk to use the wilson .
a wilson 1000 would be a good choice. the k40 antenna doesnt have the receive range of the wilson because of the capacitor tied to ground to help it tune.
i still feel the van ordt power whip 5 1/2 footer would do a great job.