My M11A1 also came from GM as the local store closed.

I put a set of Hogue rubber grip panels on it and really like the grip/feel they bring to the gun.

It is now my EDC gun.

For OWB carry I use a Galco FLETCH High ride (as some have already mentioned) or a Fobus molded paddle holster.

For IWB I use an Ozark Holster IWB Hybrid.

I Love the M11-A1. I have 2, put a NIB one away and bought a slightly used one to shoot, I like the G-10 grips a lot better than E2 grips. Not sure you will need the whole "kit" with the main spring strut? Others can weigh in, but would highly recommend you put that money toward G-10's.
Also look at the DeSantis Speed Scabbard for a P229 NO RAIL, nice holster.

[IMG:left] IMG_0637 by jwzzx, on Flickr[/IMG]

M11-A1 by jwzzx, on Flickr

The factory plastic grips were just a tad too big for me too. I went with the Aluminum Sig grips on mine and it made a world of difference to me. Tackier too.

My M11-A1 is the softest shooting gun I own. Its just a pleasure to shoot.