I just got my hands on a D50 from a friend and have a few questions to ask. I have been an Olympus E series shooter for several years and no nothing about Nikon. Now I own a D50. I want to switch to Nikon all the way so I want to buy two good lens's. I know I want a 70 or 80-200 2.8 and a fast lens comparable to the stock lens wide angle lens. Isn't there something about the auto focus motor I need to worry about? In lens or on body motor and what brand do you suggest for the money. I want to spend the least amount possible.