380 would be my back-up choice as well. Still haven't settled on brand or model.
Noah,
Here's a great site on the background of the Galil (S)AR .223s
http://world.guns.ru/assault/as23-e.htm
This as well as the many AR 223 rifles are decendents of the Russian Kalashnikov AK-47. Examples made in China, Spain, Germany, Belgium, US, Israel etc.....
Discovery Channel did an excellent bit on the Galil rifle. They dunked in water/dirt, broke a door down with it and it fired perfectly every time.... Arguable the best combat rifle made.
I also have a particular liking for the awesome HK 91 (aka G3).