JB I love the Smith, but be advised, in a 3" with full power loads is SNAPPY, that is an understatement. With the specials, slightly snappy and fun. I own some Smiths with the lock, I removed them, I know some will say NOOOOOOO, but you fix whats broke.
The Ruger is a fine pistol, but like GMG said, 41oz, over 2 1/2 lbs, that"s as much as a 6" Smith with a standard barrel, not the underlug type. Ruger beefs up things for no reason, now if they take the same idea they have with the LCR, who knows? + I like the S&W action better. If your not in a hurry watch Gunbroker or Guns America and find a Lew Hortons special, without the lock.
They were the king of short magnum revolvers, and they are just down the street from S&W, they had lots of special order revolvers. I have a 3" 625, .45acp, and depending on loads can be a handful. A Lew Horton special will normally bring a premium, but an old one has increased in price from retail back then, but might actually be normal price now.