There's lots of good CB's out there...

Some things to look for:

Get one that has a "memory wire" so the CB comes up on the channel where you left it after powering down the vehicle.
Nothing I hate worse is to fire up the CB and have it sitting on channel 9 by default.

Don't know if a PA system is important, but be sure to check on it if you want it.
Many CB's are coming without the PA option.

Firestik is a good brand antenna and you'll need to make sure you tune it, once installed.

I have the Cobra 18 WX ST II Mobile CB.
It's all 40 channels, has 10 NOAA weather channels, 2 quick pre-sets, instant channel 9, and a forward firing speaker.