he already has his tank zepplock, give him some time, corals will come =)
yes used 18-55 is ok, but I'd still wait. Why spend money now on something that you will FOR SURE replace?
Though if you want the camera now, and want to train yourself as a photographer, and get a lens that you'll keep forever, a $90 Nikon 50mm F/1.8D is a really nice lens. Sharp as a tack, fast focusing, light, great image quality, etc.
It'll teach you how to compose your pictures by force with it's fixed focal length
Keep that until you can afford the 18-200.
Or if you really become a hobbyist, scratch the 18-200, and get the 17-55mm F/2.8 and the 70-200mm F/2.8 and call it a day. Eventually you'll want the 85mm F/1.4d which is great for low light indoor close crops... maybe by then it'll have AF-S. I was just talking to Ibn about that yesterday =)