You know Bob all of us being gun nuts here is like asking a bank robber what denominations does he prefer when he robs the bank...........of course he wants the large ones..........but bottom line is he wants them all.........Just like we always want another gun / guns. My thoughts are while the pm9 has a match grade barrel and a little nicer finished slide, there isn't enough of a difference to trade or sell the cm for. Now that said, if you are just buying it as another gun or just really want it and are good with the deal, by all means do what makes you happy.