cb speaker

Which CB Radio External Speaker to buy? This would be for a small compact car, not a big Trucker Cab. So many to choose from but sounds like noise cancelling feature would be nice to have. MFJ-281 Cleartone, Workman 714 astic, Cobra HG S300, Astic 302-VS4, Uniden Bearcat BC7 or BC15, RoadPro...