I would say go for it. He might start marking and that is a pain in the butt, something that you don't want to have to deal with. The surgery sucks, but girls have it worse, and it's better just to get it over and done with. It's a responsible desicion to get him neutered on your part, and when you take him out to play with other dogs you wont have to worry about him getting other dogs pregnant etc. Also he is young, and may develop aggresion so neutering would probably nip any of that in the bud too. I say go for it!
Hannah