I have the 4" but which is very accurate at 6 yards and 10 metres. I recommend you get the 6" if you can find it though, longer barrel = more power = flatter trajectory = better accuracy!
I don't think the silencer can be fitted to the 6", but you can put the adjustable sights on! I have them on mine and I find the sight picture to be excellent! Once it's zero'd it's surprising how accurate these guns can be! The triggers a bit rough/stiff, but single action it's quite predictable and once you're used to it your shots will break without disturbing the sight picture at all! It also smoothes out with use!
I reckon you should get the 6" nickel version with wooden grips and adjustable sights! This will add up to an expensive gun but I guarantee it'll provide a lifetime of enjoyment and accurate shooting, plus it looks the business!
Oh yea, and the nickel is painted I believe...