SBR 1 or 2 AR lowers.
First build should be 10.5" 5.56, lightweight barrel. Perfect suppressor host, anything longer/heavier is just not fun IMO. Maybe even save a few ounces on your mount (direct thread).
12.5", I'm sure its good all around, but I would go ahead and get a 16" 5.56 as second upper so you can take your gun across state lines w/o paperwork in title 1 form.
For your 22lr. Get yourself a 22lr dedicated upper so you dont have to SBR the 10/22. The advantage is you can play with barrel lengths for your 22lr as well. You'll find advantages and disadvantages to all lengths of 22lr:
4.5" = dedicated 22lr suppressor host, endless fun, too bad you'll go through so many roundsyou'll be cleaning the can every other range trip. Keeps bulk pack subsonic but requires super short handguards, or a short 7" handguard with always-on suppressor underneath handguard
7" = same as 4.5", but doesnt require a can for a 7" handguard, may not keep bulk pack subsonic though so not as quiet or you'll need to pay more for subsonic 22lr.
10.5" = looks and handles just like your 10.5" .223. Normal length handguards
16" = good for interstate, "normal" ballistics, add a scope and it does everything your 10/22 can do. In fact, after your first few outings with a good-functioning 22lr AR, you'll ditch the 10/22 as redundant.
Then of course you'll want your 9mm, .300blk (you can conceivably do all of these with 2 lowers, conveniently. Maybe keep a 3rd pistol lower.