Most would agree Savage makes the best bolts under $500.
Most would agree CZ makes the best bolts for a little over $500.
IMHO the Anschutz 1400 series and IZH 7-2 are the best under or at $1000.
Assuming you want a sporter and a commonly available make, not some custom or special order rifle, there are Cooper, Anschutz and Sako.
At just under $2000 the Coopers and Anschutz 1700 series are my favorites.
We need more info from the OP to reach any concensus as to what constitutes the best .22 LR bolt.