First off, don't be dissing the D200! I still use mine regularly, and other than a shutter replacement due to operator error (mine), it still works like it did the day I opened the box. I still like the image quality at low ISO.
As for lenses, it really depends on your budget. If you have the bucks to spend, the 24-70mm f/2.8 is an incredible beast. But I chose that because I'm moving to FX this year. If you plan on staying on the DX side, the 17-55mm f/2.8 is supposed to be really good. I hear the 16-85mm is a cheaper option that is still pretty sharp with a larger range. If you're looking for a good wide angle lens, I use the Tokina 11-16mm f/2.8. That one is a great lens too, and worth the price. If you need a good prime lens, the 35mm f/1.8 is the DX equivalent of a "normal" focal length lens. It's good. And then, of course, there's the 18-200mm VR super zoom that isn't the best optical performer, but it's versatile and the results aren't too bad. I still use mine occasionally, until I decide to sell it. Hope this helps.