Only because it hasn't been mentioned yet and the OP's talk of looking at CZ's:
People love CZ bolt action rimfires because they usually provide value. The 452's (fixed barrel) are basically gone. Discontinued years ago, there are the "Grand Finale" ones with scrollwork are out there but those are more than OP's budget. Used 452's are out there, if you can find them, but many people aren't willing to let them go. These aren't competition rifles, but they are quality sporters.
The 455 (which replaced the 452) has the ability to change barrels, but it has been value engineered. It did not attain the level of success as the 452. In comparison, the 455 typically provided modularity at the expense of a little accuracy. These are also discontinued, but only recently, and there are a lot of these still available. There are a reasonable amount of reports of buyers not being satisfied with the accuracy. A lot of this has to do with the comparison to the 452's. The 455's still had the same specs - a group size less than 1" at 50yds with CZ's test ammo. It's just that many people had 452's that would run somewhere between .4's and .6's center to center with ammo that the gun liked.
The 457 is the new offering. They redesigned the receiver, changed the safety, but kept the same modularity, with 455 barrels fitting 457's. The only confusing thing is that there are a few factory models that are accurized. So when someone says, "My 457 MTR and Precision Trainer shoots bughole groups at......yards with..... ammo" - that isn't the typical 457 rifle. It's a 457 that costs almost double (or more) of what the typical 457 American costs. Just be aware of the 457 model when reading/comparing accuracy reports.
Finally, the CZ rimfire that nobody talks about is the CZ 512. Semi auto, aluminum receiver, usually stiff trigger. But, good accuracy and semi-auto functionality. It will not win a bench rest competition, but I think it is a better hunting gun than the CZ bolt actions.
All this comes with the caveat that these are mass produced rifles, so production quality does vary. A person can hedge their bet with paying more for an accurized model, and get better performance, however, the "consistently inconsistent" nature of 22LR ammo also applies.