I want to learn use telephoto lens but one of lens in my wishlist, 70-200mm F/2.8G is wayyyy to expensive. Dun think can manage to get them even in 2012. LOL. How bout Nikon 70-300mm f/4-5.6G. Will i regret getting them or should i wait in year 2016 when i have the money to buy f/2.8?