Try a Simply Rugged (www.simplyrugged.com) with their "Inside Out" straps. I have one for my for...
3" Ruger SP101
4" Ruger GP100
5" N Frame (629 and 625)

They've served me very well. And with these Inside/Out straps you get a good quality IWB AND OWB holster both.

I'm just about to place my order for the 3" N frame (625) that I just picked up.