Most "Target " sights ARE all black. Action sights tend to have dots and inserts for fast vs deliberate target sighting. Still if you want to try new sights, I'd suggest some fluorescent model paint before spending $.( Just white undercoat first. Then top color. Apply with toothpick.) That said, I do like the Fiber Optic front sight set-up that soem around here are running.
As for grips, they are a personal thing. If bullseye shooting , something with a thumb rest is nice, however if two hand/switch hand action shooting, forget the thumbrest. Grips for K frames basicly come in three sizes/configurations. In order of small to large look for: (S) front & back of the grip frame exposed, (M)back only exposed, (L)nothing exposed. I personally like Hogue Monogrips but that's just personal.
Lastly, I'd suggest saving your $ for good ammo. Accuracy is about consistency and I've yet to see cheapo high velocity stuff shoot consistently.
FWIW, all my .22 target pistols ( including 6, mod 17/617's) shoot Wolf Match Target VERY well.
p.s If your going to do any action/game shooting, get some good DS speedloaders.