OMG get a wilson 1000 with the 66 inch whip and forget it!!!!!
You'll do fine with the SWR meter. It'll be accurate enough for anything you do with CBs, and if you need to in the future, you can spend some money on a separate meter. I'd advising spending money on a meter for modulation and watts if you start getting into the hobby more.
Whereabouts in the world are you located anyways?
-Richard-