I only recommend 2 holsters. The Comp-TAC MTAC, which is best for CC. And the Raven Concealment,'which is best for OC. You CAN use the Raven for CC too.
For what it is worth, I actually have a Raven Phantom for the 9c for sale or trade. I picked it up in a trade not sure what my next pistol would be and ended up opting for the M&P9 Pro 4.25" which was a perfect fit so now I have the Phantom for the 9c and no gun to go with it. PM me if you'd like pics or are interested.
I can't say enough good about the El Paso Saddlery holster and gun belt I got a few months ago. I did a review of them here on the website. My MP is a hard to fit one, being that it has the 5" barrel and front fiber optic sight. Extremely well made...fits my gun like a glove...and extremely comfortable. I went from not carrying to all day carrying overnight. And it conceals very well for an OWB holster, just flop a shirt out over it.