Three very good .22LR choices:
1. Ruger MKII or MKIII
2. Ruger 22/45
3. Browning buckmark.
5.5" barrel with adjustable sight would be good; it balances better than the 7 inch barrel and allows plenty of sight radius for accuracy.
4.5 Ruger 22/45 - I do not have, just shot a few times, I like it. If I do not already have multiple browning buckmarks and ruger MKIIs, I would get a 22/45 with the wood grip.