My current small light weight Concealed Carry revolver is a 442 Pro Moon Clip. It is +P Rated, Reloads a little quicker with moon clips, than with the commonly available HKS or Safariland Comp I speed loaders. California Competition Works is now making a J Frame 5 shot moon clip carrier called a Shoot A Moon (SAM) that works with both J Frame 38 and 9mm Moon Clips. With it you can belt carry a reload or two infront of the revolver on the belt. I belt carry my 442 most of the time in a Lobo Model 1 Pancake at 4 O'Clock.
I have installed "Lime Green" Sight Brite sight paint on the upper 1/3 of my front sight serations. This really helps to pick up the front sight. Finish 442 vs 642. I am not sure if all 442's have the same finish. The finish on my 442 Pro Moon Clip is just fine. I much prefer it to my previous S&W J Frame a 638.
The 442 Pro Moon Clip can be loaded with Loose Rounds, Speed Strips, HKS Speed Loaders, Safariland Comp I Speed Loaders, J Frame Jet Loader, as well as Moon Clips.
The only source I have seen for the 442 Pro Moon Clip is Bud's.
I have also owned an LCR 357. It is a hair heavier than the LCR 38, and J Frame Air Weight S&W's. This is not totally a bad thing as it helps soak up recoil a little more. I would shoot low velocity 38 Special practice ammo in it for practice, and carry 38+P or Speer 135 grain Short barrel 357 Magnum in it for CC.
One big advantage the LCR has is a pined on front sight. It can be easily changed to Fiber Optic or a 24/7 Tritium Night Sight.
Next up would be Steel J Frame size revolvers. They are still small just heavier to pack. The packing part is not a problem if you belt carry in a quality holster such as a Lobo Model 1 Pancake or Rays Enhanced Pancake. The Steel J's are too heavy for me to put up with pocket carrying, though some do with no problem.
The Steel J's such as the 640, 60, 649, 49, 36, and Ruger SP101's are not a bad choice at all if you plan to belt carry. They are still small, and being heavier they are more shootable than the air weights. Some models of the above have pinned front sights. I wish that all models did. Barrel choices are 2 Inch 2-1/2" and 3 Inch to round them off. All have advantages. The 2 is a little easier to conceal, the 3" is more accurate in aimed fire, and the 2-1/2 is a little of both.
My next revolver will probably be in this group. I am leaning towards a 3" this time. I have had 2" one's in the past.
I am a S&W Guy, however I have zero issues owning a Ruger SP101 either. It is a quality revolver and all have a pinned on front sight.
I think I would include Snub K Frames also. My most carried revolver would be my Custom 3" 66-2. I also have an Air Weight K, the 315 Night Guard. My Barbeque Gun is a 2" 15-4, a nicely blued Beauty in new condition. The K's are reguarded my most S&W Fans as the most Shootable Revolver ever made by S&W. I think I would agree with that statement.
I have 2 SSR Revolvers. My old gun is a Police Trade In 64-2 (K Frame). My new just completed SSR is a 686-5 (L Frame). Ron Power "Power Custom" has worked on both of them. In the last couple matches I have shot both revolvers. The old 64 has turned in a better time both matches. Not by much, but still ahead of the 686-5.
A 2", 2-1/2" or 3" K Frame is not a bad choice for Concealed Belt Carry either.
Another thing I will bring up. An understudy revolver. If you are going to shoot an Air Weight J Frame, I recommend getting a small 22 such as the LCR 22 Ruger has out. Now what you need to do is try and wear it out. Take it to the range, down to the creek, or where ever, and shoot bricks of 22 ammo through it. I have the LCR 22, and it has really improved my 38 J Frame accuracy. The 22 is about like Dry Firing the 38 with target feed back. I find that firing the 22 is much better than dry firing the 38. Both help to build up your trigger finger, steady your hold, etc.
OH by the way, you are moving away from the Dark Side going to a revolver.

Enjoy what ever you decide on.
Bob