Browning Buckmark makes one of the best shooting auto loader 223's out there. The Ruger's are really nice too but I like the triggers a little more om my Browning. I have a MKIII and a Buckmark and would not want to get rid of either.
If a revolver is to your liking there are several. THe S&W's are at the top of my list in that area but I'm really fond of those old High Standards too.
A 10-22 Ruger rifle is also a must have for kids young and old alike.