Pipeline,
Check out the Pachmyar Compac grip for the 642. It is hand filling but still very concealable.
"It was the best selling firearm offered by Smith & Wesson in 2006."
-from
http://www.snubnose.info/docs/m642.htm
You might like to reading THE SNUBBY REVOLVER by Ed Lovette, a former law enforcement and CIA guy. He writes for (or did) Combat Handguns magazine It is loaded with good info from a guy who has been there and back.
Good luck on your decision.