I'm not sure you could say the Beretta is more reliable than the CZ, save by anecdote only. They are both on par when it comes to reliability. Ditching a pistol because you are afraid a slide stop will break and buying the much more expensive Beretta doesn't seem like the best thing to do, unless you are just hankering to get the Beretta. A free slide stop is, well, free and as easy to fix as taking the pistol down for normal cleaning. And, there is no guarantee either the Beretta or CZ will ever break in the first place. I have personally never broken a slide stop on any of my CZ's, and I have owned many.
If the 85 fits you, then keep it and don't worry. The slide stop and deformed roll pins are the two most seen troubles with CZ's (some folks get stronger recoil springs, but I never have and have never had a problem with stock springs). The double-roll pins solved the problem with the pins (and a roll pin is very cheap in any case to replace) and so CZ's have no issues with dry firing. Berettas have not only had brocken blocks, but also cracked slides. Glocks go Kaboom, too.
The point is, if you want to get the Beretta, then get it, but the CZ will be every bit as reliable and durable, if not more so, than the Beretta.
Ash