10/22, or else a Marlin 60.
I have a 10/22, I got Williams firesights for it, as well as a bolt buffer and a new trigger set.
It shoots a dime sized hole, and is quieter than my pellet gun! Oh, and a brick of 500 will cost you $9 at Kmart. So shoot all day long and the piggy bank is still fat.
I've ran about 8000+ rounds I'd venture to say through that rifle.
The other gun I got to mate it is the Ruger 22/45 pistol. It's a 1911, but in a .22LR. Very sweet shooter, accurate as hell, and if you want a lot of range time without blowing $$$, a 10/22 + 22/45 combo is hard to beat.
Also, on a 22/45, you can teach yourself good pistol habits without the expense. Same with the 10/22, learn breathing control, aim, trigger control etc.. all for cheap cheap cheap cheap cheap.
.22LR is a great round, don't let anybody lie to you about it.
Albert