To me it worth the extra $'s for the PM9.
I have the all black PM9094NA w/nite sights. You can't get an all black CM9.
I prefer the dovetail FS on my PM9 to that of the screwed on FS of the CM9. The dovetail sight will never fall off like so many stories of CM9 front sights.
When I bought my PM9, the CM wasn't even out yet. If it had been...I would have still gone with the PM9.