Personally, I don't think a good reason exists to buy a new 22 magnum rimfire rifle today; not since the 17 HMR was introduced in 2002.
I have and have had many 17HMRs, and every one of them has been very accurate. I've owned one 22 magnum Savage bolt action about 12 years ago and sold it because I could not get the accuracy I wanted out of it. 1.5 inch 5-shot groups at 100 yards does not cut it for me.
From what I have read over the last 20 years, this is very typical. People struggle to get great accuracy out of the 22 magnum rimfire. With the 17HMR, excellent accuracy is EASY, even in the cheap Marlins. Of course there are exceptions, but why take the chance? Go with the odds. The odds (based on my and my friend's experience) are that you will get 100 yard groups around 3/4 to 1 inch at 100 yards no matter which 17 HMR bolt action rifle you buy.
I also own very accurate 22 LR guns, but my 17 HMRs will always group better at 100 yards, especially if there is any wind at all. Much better wind resistance and almost no bullet drop to worry about from 0 to 125 yards.
Theoretically at least, the 17 HMR will have slightly less recoil because of the lighter bullet and make slightly less noise because of the smaller hole.
The 17 HMR explodes prairie dogs very nicely out to 150 yards. I've killed them out to 200 yards with it. It is a fantastic round. That is why it is the most successful new cartridge introduced in the last 10 years.
Most of the people who are shooting 22 magnums are shooting them because they bought them before the 17 HMR was introduced, or because they believe they are better on larger game. I doubt that claim, especially since you can get 17 HMR ammo with the better penetrating 20 grain bullets. The 17 grain VMAX bullets expand and come apart very quickly upon hitting something. This makes ricochets much less of a problem, and also makes them very effective on targets up to the size of a jackrabbit or marmot. Many coyotes are killed with them at closer ranges. I would not shoot at a coyote beyond 100 yards with them.
I've never paid more than $9.99 per box of 50 Hornady 17gr VMAX ammo. I just wait for sales and buy thousands. The farm stores often have it on sale.
Add to this the fact that the 17 HMR is flatter shooting, and there is no contest. Get the 17HMR. For best value, get a CZ. If you don't mind the cost, get an Anschutz. If you can't swing either, get a Marlin and lighten the trigger by replacing the trigger return spring.