These seem to be all over the place when it comes to design, materials, quality and price. Where to start? I'm looking for a S&W M 640. I've seen $11 Uncle Mikes and $50 customs on line. I don't mind spending more if the holster conceals better but will it? I also plan on adding a IWB and OWB to the collection but those are even harder for me fathom than a simple pocket protector, so I figure I'd look for the pocket holster first. What I'm trying to avoid is spending a lot of money on a lot of different holsters I won't use. Thanks!