I'm waiting on my MR from the Ruger store- really wanted one for a while now. Also have a CB-ST. More expensive than the Fobus (which I also have) but much more stable, comfortable.
I use the same holsters that I use for my M&P40. I have a Fobus, a Bianchi and a Blackhawk Cover Six. They are all about an extra 3/8" long, so a holster for an M&P40c should probablywork out just about perfect. I tolerate the extra 3/8" of length, because the holsters will do double duty and they are familiar.