Personally I would look at a Ruger Mk. III. Good luck.
I have a Ruger MKII and it is a great little gun, but a pain in the ass to clean. I have never shot a buckmark, but hear they are nice. One day when I get a suppressed .22, it's going to be a Ruger MKIII.
There's nothing wrong with a heel mag release, but if you train with it at your thumb keep it there.
If you want a neat looking pistol made from pot metal go with the p22.