There are lots of threads on this same question.
$600 will buy you a lot of nice 22s.
I own 2 Rugers and 1 Buckmark.
One of the Rugers has Volquartsen guts and I still MUCH prefer the Buckmark.
Better feel, grip angle, balance and controls.
I shoot 1911s and the Buckmark is much more natural for me.
I will sell you a nice, like-new Ruger MKII 6" with VQ upgrades, original box if you're interested.