Used 686s seem as rare as hen's teeth so I'm considering a new one. I've narrowed it down to 4 choices and would appreciate some feedback to help me decide on one. First, barrel length: 2.5" or 3" and why do you hold this opinion? Second, 686 or 686+? The plus with 7 rounds is about $30 more, but is it really worth it in a cc gun? TIA