If you want pellet rather than BB - You might consider the Umarex S&W 586?
10 shots rather than the usual 8, and by far the best trigger of all the Umarex replica thingys.
Fully adjustable sights, and it's capable of putting all 10 in the black on a match card.
It's not a pistol though. It's a revolver. Or a 'spinner' as the gangsters like to call them.