Weeel, the most accurate will be the ones with the guarantees, such as Annie(anschutz) or Cooper. But the will cost you a lot of dough.
CZ, for a mass produced out of the box rifle, is double tough to beat, and not a ton of money. Savages can be extremely accurate as well, I think they bought some of Annies' tooling or machining for makeing bbls, but they are hit and miss as far as I am concerned , with the 17's. Most of them tend to like the 20 grain bullets better, and this to me, looses out on what you buy a 17 for, a laser like trajectory. Marlin, to me, is the gem of the bunch; cheap and good. Now then, they will have a crap trigger but that is easily fixed by you, and you allways , ALLWAYS, channel out the stock on a marlin 17, it will help in accuracy. but marlin in my mind, really got the chamber demensions down for the 17's, the mach 2's as well, and they really can produce some fine accuracy.
Also a nice change of pace would be a thompson/center, and get your bbl made. but just to show you how accurate an annie can be , check this;
this is with a 22 of course, but it is par for an Annie; check about halfway down the page.
http://www.rimfirecentral.com/forums/showthread.php?t=179525&page=15