I have been using a Nikon D200 for some time now (picked it up used a little over a year ago for a good deal), and I like it a lot. However, as GS said it is an older sensor and does great in plenty of light, but I try not to go above 400ISO because of the noise handling. I slightly prefer the focus ability/flexibility of the D200 over my Canon 40D, but they are pretty close to equal on that point. The D200 is a great camera and was highly lauded when it first came out, but it is now "older technology", which happens pretty quickly nowadays. I would also suggest going for the better sensors that are available now, plus the extra features that have been incorporated of late as well.