My family has two ARs, but the ammo is too much these days. Even Wolf or other cheap stuff is close to $400 for 1000 rds.
On a side note you can get the trigger pack for a full auto 10/22 for $8500.

I guess you'd make up the savings in shooting 22 cal @ $12 for 500 rds.

My short list of rifles that (realistically) I can/will/want to buy.
AR-15 w/ 9mm and 5.56 uppers
10/22
AK-47 variant in 7.62x39mm it's still cheap <$200 for 1000 rds
Hand guns.
Commander sized .45
S&W M&P .40 compact