I prefer a 4x scope on my Contender, maybe even something like a 2-8x variable. The reason for this is that the 22's shoot so dang well that having the extra magnification makes it so much easier to see out to 50+ yards. Up close on targets at 25 yards or so it's like surgery!
If you paint the sights, you might try one of the "paint markers" with some bright yellow. My Ruger MKII is much easier to shoot with the front blade and the very top edge of the rear sight painted. By putting that touch of paint across the top edge of the rear blade it makes it easier for my eyes to pick out and level the front blade across the top of the rear sight.