If I knew a perfect (name your caliber) plinker existed, I'd have one. Or more. But, here goes:
S&W Model 63. 22lr, or short(er). J frame, 4" barrel, sort-of-target sights. I have one, and I'll have it until I'm 6 ft. underground. And maybe then, too. I hope my wife unloads it before she has me cremated. It is a Double Action revolver, has Decent DA & SA pulls, but not down where you want them.
Ruger Bearcat. 22lr. Single Action only. Similar in size to S&W J frames.
Don't know what either gun is going for used, you can probably find typical prices on the web.
Don't like black sights? Get over it.
If the front sight width and the opening in the rear sight are correct, there will be daylight (or target) showing equally between the edges of the front sight and the edges of the opening in the rear sight. There are fancier sights available, but they are rarely, if ever, better than black front sight & black rear sight. Of course, if you want a barbecue gun, you could put a gold insert in the front sight, etc. White dots are OK, as are tritium sights, if you want a self-defense gun.