I currently have a Connex 4600 in my truck... replaced a Connex 3300HP. I also have a Cobra 29, a Uniden PC66, and a Uniden PC76.
I travel cross country and I could not imagine NOT having a cb... I usually have two cellphones and a GPS with me, but it is nice to be able to just reach down, and hit a key to ask directions... a GPS won't tell you the best route around an accident... a cell phone is a little clunky and your buddy in state X isn't going to be able to tell you there is an accident in state Y.
IMO, for a good basic cb, you can't beat a Cobra25, Cobra29, Uniden66, or Uniden 76... have one of these tuned and peaked (cost you an extra $20), add a high quality antenna (mag mount in the center of the roof is about the best), and it's all you need.
steved