Obligatory Ruger Mk III post. The rundown:
1) Cheap to shoot. 2 bucks for 50 rounds at my local Gander Mtn.
2) Accurate. I've only been shooting since August, and I get consistent 1.5-inch groups at 10 yards with this thing.
3) Durable. Barrel and receiver are made from the same piece of steel. I'm told my grandkids will be able to shoot this gun after I'm long gone.
4) Reliable. I've got about 5000 rounds through it, and it's stovepiped a couple casings of Winchester bulk (crap) ammo. CCI, Remington, and Federal all shoot 100% clean.
The gun itself is a little pricey, $400 for a 5.5-inch bull barrel model, $600 for the 7-inch model I own, but completely worth it, for a plinking gun. It is a .22, though, so if you're going to carry, it's definitely not ideal.