I gotta disagree with you a little bit when it comes to the glove issue mozfonky. When you are just starting out boxing, you need to learn proper technique before anything in my opinion. If this guy is already working on a heavy bag and mitts, hopefully he knows how to throw a punch without putting a lot of strain on his wrists and hands. If not, go with the 16 oz gloves for sure, because they protect your hands more. Also, make sure to wrap your hands PROPERLY. I can't tell you how many times I've seen guys hurt themselves because they have a bad job done on their hands......it's kind of sad really. Not that I'm an expert or anything, but I've been around a bit, and I've never once hit a heavy bag without wrapping my hands first....some guys do, but I think that's it's like playing Russian Roulette with your health.
Bag gloves are cool once you've gained some experience, althought they offer basically no protection for your hands.