If the CZ 455/457 is the price range you're looking at, you may have already picked the best one. Anything Anschutz is a good bet. So is a vudoo, but they cost more.
The Savage B22 is decently accurate in your price range, but I would not recommend it due to extraction issues and poor QC in general. Mine was a pain in the butt.
A custom 10/22 can be quite accurate but I don't think they win a lot of bench rest competitions, so that may not be the way to go if you want the most accuracy possible. They also get expensive. Mine is about 1 MOA at 50 and 100m with ammo it likes best, a little worse with CCI SV.
The Tikka T1X is interesting, but I don't have one to give a first hand account. IBI makes a prefit barrel replacement for it so if it doesn't shoot well out of the box there's a fix available.