If it's a regular 40/80 channel FM CB then there really won't be much difference in performance between them these days but the Intek M100 is pretty compact and offers multiband options if you decide to go abroad. All should be limited to 4W output but if you want to increase the range (illegally) then a small amplifier will boost it, RM do some cheap good quality 'burners'. As for aerials, the longer the better, if length isn't a problem then get a Sirio Megawatt 4000PL, TBH range will probably be limited by interference from the fuel injectors anyway.