I would never buy a revolver you can't cock it as a SA option. You could give me one, if I could sell it!
I do mainly (95%) practice using double action only at 7-15 yards though, and do pretty well, but it's just so much fun to bring the target out 25+ yards and enjoy having that SA hair trigger option if I want to for a more steady shot, with my 638, or a 649/.357 (shrouded hammers). I know the gun's not meant for that, but the gun can be very accurate at 25 yards, more than me.
Good luck, I hope you buy the right gun for you.