Any of the S&W Airweights or Airlites work great with a Crimson Trace laser grip. I use the LG105 defender, they are basically a polymer frame with the activation switch on the inside of the grip. Their is no on and off switch but you figure out to activate it and turn it off by applying pressure.
There are two other options for the j-frames; the LG305's and the LG405's. The 305's are similar to a Houge mono grip, which I think defeats the purpose of a pocket gun but people seem to love them. The 405's are the same length as a boot grip but have extra padding on the back of the grip and feel more swelled in the palm area. They feel great in the hand and I really came close to buying them.
The 105's pretty much feel like a pair of nice wood grips. I've found I shoot better with them (laser on or taped over) then any of the grips I own for the 637. To top it all off, they just look great on an already great looking gun. While they are not as small and lite as a LCP, they are very pocketable and shootable guns.
Here are some different holsters:
Mika black
Mika brown
No name eBay
Desantis Nemesis
In big pockets the Nemesis is the best of the bunch. For smaller pockets the no name eBay is the most comfortable but comes out a bit on the draw. The Mika is a good in between holster that stays put on the draw and in the pocket.
Sorry for the long post, I just love lasers and pocket guns. Hope this helps and let us know what you decide.