Hi, I have a 455 16inch barrel in hmr. I really like it. The triggers are nothing like the other model cz's. my dad has a 452 and even with the trigger kit fitted its shite.
Your choice with the weihrauch is a good one, the only downside for me was the hogs back stock it comes with, didn't feel comfortable for me.
Why don't you look at anschutz? Again if you don't mind the price thy are superb and the triggers are just like the hw100.
Other thing to think about is how are you going to use it? From a motor? Walking? Etc etc. barrel length is then an issue.