i've tried so many holsters for my P3AT - some good expensive ones too - but i keep coming back to the very first one i purchased:
the $12 Blackhawk size 1 pocket holster (
http://www.blackhawk.com/product/Pocket-Holster,82,34.htm). it appears to be exactly the same as the uncle mike's pocket holster. you can find them for under $10 online.
the holster thin, flexible, light and so easy to draw from. the material is rubber-like and always stays in the pocket. in fact, it sticks in the pocket and doesn't move around in larger pockets. it's thinner than the nemesis and doesn't print at all.
when i put the crimson trace on my gun i thought that it would no longer fit in the blackhawk holster. i was surprised to see that it did fit. it was tight at first but it stretched out within a couple of days and it's perfect now.
check out the mod that wheelguy did to his uncle mike's holster:
http://www.ktog.org/cgi-bin/yabb2/YaBB.pl?num=1206545094#11 i did the same mod on the blackhawk holster to carry a spare magazine. i sewed a small piece of elastic on the outside seam to add some flex space to fit the spare mag in the holster wing. i'll try to post a photo later so you can see what i mean. it makes a perfect square in the pocket and it's still so easy to grab the grip and draw. it's not exactly pretty but it sure works great.
good luck!
kb