I now have 500 dollars saved and i am looking to buy a new lens or two for my Nikon D70. I have a 50mm 1.8 and sigma 70-30mm. The lens does not need to be super fast because i have the 50mm. I am looking for a general lens that is sharp. Ken rockwell's website draws me to the 18-200mm. Also looking at the 18-70mm and 55-200mm Vr.