Alright...I know this issue has been discussed here, and on other forums, and yes, this is probably going to end up being another one of those DSLR threads, but I think that this is a question that may really make my decision for me, and I would appreciate any input. I have been doing a lot of research in trying to decide on a DSLR. From what I've read, the Nikons tend to have better ergonomics and bang for the buck, while the Canons tend to have better IQ as their forte. In particular, I was looking at the high ISO performance of the D200 vs the 5D. Over the last 5 years I have been a P&S shooter, though before that I owned a Minolta SLR. The main question I have is how important is it to have good noise performance at high ISO? In my film days, I really never used a film faster than 400, yet I doubt I ever pushed the camera to its full potential. From what I gather, the D200 and the 5D essentially produce the same IQ up to about ISO400, following which, the 5D runs circles around the Nikon. How often do you guys push your cameras to high ISOs? I'm primarily interested in having a camera that will have excellent IQ, for landscapes, and when I'm travelling around. I need something that will keep me happy for the foreseevable future (and yes, I know that you'll tell me buy the glass, not the camera, but to be fair both Canon and Nikon make some top-notch glass). In particular I'm looking at the Nikon D200 with a 17-55 f/2.8, and the Canon 5D with the 24-70 F/2.8 L. Any input would be awesome.