Personally, I'd be looking for a used Marlin camp carbine in 9mm. They're stupid simple, reliable, light, and every one I've ever shot could easily hit an apple sized target at 100 yards if the shooter wasn't brain damaged.
I kick myself thinking about all the Marlin Camp Carbines I walked past for CHEAP money back in the day and then see what they bring now when found for sale. I'm on the prowl for one in 45acp that I don't have to spend a week's wages to bring home.