So I've been looking into getting a DSLR for a while, and found this site helpful in my decision, and have a few questions for folks out there. I've gone back and forth between the Nikon D80 and D200, like I've notice many others, and have decided on the D200, given my habits of traveling often, and need the ruggedness of it offers over the D80. The only problem is, that it's more expensive and cuts into my ability to get better quality lenses at the moment, which is disappointing, as lenses are very important. I've read a lot about the greatness of the Nikon AF-S DX 18-200mm VR, and wonder if anyone has any experience with similar lenses made by Tamron or Sigma, and could tell me if I'd notice a difference in quality and durability. I'm starting out in the DSLR world, and am looking to do a wide range of photos (I'll be traveling for the next six months around the midwest/northeast, shooting stuff from city/urban to landscape/nature and anything inbetween). Any advice on other lenses I should go with? Also, what memory cards have people found to work well with the D200?