i'd like to buy some new lenses i can buy for my d40, but i don't know which ones will fit. i'm not concerned about the whole autofocus ability to be honest, i'd actually really like to use a fully manual lens to work with. would i be better off just using the kit lens that came with the camera or is it wise to invest in another. i'd like to spend under 200 if possible, the one i have now is the 18-55 that came with it. thanks.