The D200 is one of the most successful DSLR's out there and a real joy to work with if you're used to shooting Nikon. You don't say what you've been using but my only caution would be not to change from Canon to Nikon (top 2) unless there is a major compelling reason - and I shoot with the D200. But I also know that Canon makes a great product and it should be what you feel comfortable with. As to lenses, the only one I know anything about is the 17-55 which is a fabulous lens, tack sharp. Take that combo, add a 70-200 VR 2.8 and you can do about anything.
"The girlshapedlovedrug messes with my mind." Gomez (the band)