Considering his obvious lack of gun buying experience,the amount of money he has available, and assuming he has no knowledgeable person to take him under his wing and help him, I would go to the neighborhood Walmarts and buy one of the bolt action Marlins and have a trigger job done on it. The used gun route is fine if he has some help or a good local gun shop, otherwise he is asking for a lesson in life at an early age.