I need some help. I want to surprise my boyfriend with a mountain bike, but I have no idea what kind to get. He does not have one now and he wants to start mountain biking, so I would need a bike that is good for beginners. He has been looking at some, but I have no idea what kind he was looking at. He is 6' and 180 pounds. I am looking to spend around $400. Any suggestions would be greatly appreciated. Thanks!