I know that everyone including the O.P. has mentioned single actions to this point, but I'm really fond of S&W "N" frames with the 6 or 6 1/2 inch "Classic" barrels. I bought my first M629-4 Classic with a 6 1/2 inch barrel several years ago and set it up with a Weigand mount and an Ultradot Matchdot. It turned out to be so easy to shoot, I ended up acquiring another M629 and a M657, all with the same barrel length and profile. Just my two cents.