I just picked up a beautiful 640 Centennial but it is a bit heavy, and i do like the shrouded hammer and SA/DA option, so I figure the 38 is the best way to go. I would look at also getting a new 638 but have decided I just don't like the internal lock, whether it is warranted or not. I don't carry anything in my pocket with any pocket carry so I'm not worried about anything interfering with the operation.

I'll definitely look at the 649 as well!