I would say if your nephew can cast your spinning reel get a spinning reel. Just about every manufacturer has options up and down the price range. I would look for enough ball bearings to put a brearing on the major axels and the line roller, usually 4 or 5 depending on the reel. The high gear ratio on a spinning reel will give him an option to use fast cranking baits. Close-to-instant anti reverse is a good option, instant anti reverse bearings are a luxury. The next option would be a levelwind feature, it cast a little further. and having a rod with some lenght will help to cast further to. Anything new rod and reel with a few ball bearings is definatly better than the hand-me-down stuff I started on years ago. I took my 4 yo nephew fishing twice and everytime I have to watch him for a few hours he asks me if we can go fishing.