I'm going to vote for the CZ550, with Walnut stock. I just bought one late last month, and fitted it out to my liking. The fit and finish of the metal parts on the rifle is first class. It is not cobbed together and made of MIM parts, etc.
I've shot the Savage, and owned Remington 700s. These can all be quite accurate rifles, and Savage accuracy is quite astounding, IME.
The detachable box magazine on the CZ is at first not really all that great in concept: only holds 4 rounds. BUT when you learn that the CZ550 and CZ750 share the same action and barrel, and that the 10 round CZ750 mags will fit the 550 action just fine, the world changes complexion.
Here is a thread on our sister forum I wrote up for the CZ. Perhaps it will help. A couple of plusses for this rifle that all the others in your lineup lack are the set trigger (moderate plus) and the controlled round feed (huge plus).
I did not like the Kevlar stock. The palm swells were just too large for my tastes, and it is made by HS Precision, friend of murderer Lon Horiuchi. The walnut stocks made by CZ are, IME, without a doubt, the best wood stocks in the industry. The details are stunning, the fit second to none, and the ergonomics perfect for my build/physique.
Assuming they all shoot similarly, I would opt for the CZ. However, I'm pretty sure the Savage Model 12 will outshine the rest of the field, accuracy wise. Too bad they are just so homely and made of MIM parts etc.