The Ruger 22/45 comes with a threaded barrel option, I believe.
For me the best value out there is the Ruger MK I-II-III and the Browning Buckmark. I think the Browning ha sa little better trigger out of the box but either will eat about anything and put holes where you want them.
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. Thomas Jefferson