I'm a big fan of .32 as a great suppressed caliber. Low recoil and great sound with 9mm cans. It hits a nice sweet spot between the .22 and 9mm and the host pistols feel "real" compared to your often toy like .22 hosts.
I had read the 80x took 81BB mags and you can run Allegheny's threaded barrel in them. I can confirm this is true as this weekend I put 100 flawless rounds through my 80x with a couple of suppressors.
I'm a big fan of the Beretta pistols including the 81BB in .32 as well.