I have a 457 MTR, 453 Premium, 452 FS and a 455 varmint. The 457 MTR is just about the most accurate, followed by the 455, but there really isn't much in it.
What sort of target shooting do you actually want to do? If you're just trying to get the best groups that you can, then any of the CZ's will work if you feed them decent ammunition (Eley Match etc). If it's competitions that you're interested in, then look for an Anschutz Match 54 rifle. 😉