Brett;
I've got a 77/22 and several 452's. Enough 452's that I feel no need to buy a 455. The largest reason I don't have more than one 77/22 though is that I can get CZ's configured for left hand use. The Ruger company apparantly hasn't figured out how easy it is to do mirror-image with CNC units and refuses to accomodate over 10% of the population.
If your shooting plans include areas where a scope would be beneficial, then by all means get the 77/22 if you're shooting off the right shoulder. If you're a lefty, just get a good used 452 American & scope that.
With any .22 rimfire though, you have to do the ammo testing in order to get the best accuracy the gun is capable of without changing barrels & expensive mods like that. I've found in the vast majority of cases, complaints about a .22's accuracy were directly linked to apathy about ammo testing. And this holds true with both CZ and Ruger.
The 77/22 trigger is not the best out of the factory. It only took about 10K rounds (OK- OK, there's some exaggeration there) for mine to smooth out. It is much easier and less expensive to correct a CZ's trigger than the Ruger's, thanks YoDave! OTOH, Ruger mags are much easier to get ahold of & about half price compared to the CZ's.
You pays yer nickle & you makes yer choice.
900F