I was reading some posts from last month in response to a man that asked about a Nikon D300 vs a Canon 5D. I have a completely different situation but essentially the same question. Any advice would be much appreciated. My current camera is a simple p&s Canon SD800IS. I love it but am dissatisfied with excess noise in low light situations and I can't seem to correct it with any of the settings the camera has. So that is probably my biggest pet peeve. I am currently what you might call a semi-pro photographer with high aspirations. My photos are published in my company's magazine nearly every issue. But most of those photos are taken with the company's Sony H5 (which I really don't like) or my Canon p&s. It's really time to upgrade and I'm considering the Nikon D300 and the Canon 5D. I like the "weatherproofing" in the Nikon since I do mostly boating photography on or near the water, but in my experience the term "weatherproof" doesn't mean a whole lot, especially when you're talking about the boating industry. But I also really like the full-frame sensor in the Canon 5D - and the kit lens is phenomenal. I've looked them both over at my local camera shop and the lens on that Canon would really be great for the kind of shooting I do most often. Other photographers in my industry use Canons all the time but there are probably a near equal amount of Nikons. While it's probably more like sports photography than anything else, it's not the kind of fast action you see in a football game or something like that. Speed doesn't seem to be a huge issue unless you're the guy on the jetski trying to get the shot of a wave crashing over the bow of a sailboat in a big match race. I probably won't ever do that. Most of my current shoots are product testing on the water with multiple boats. I grab photos of boats wherever I can and hope to do more travel writing and photography in the coming years. So I hope that's enough information for you photophiles to give me some much needed advice. Thanks all! On, one more thing - I have no lens collection that I plan to use (only some old Nikon lenses from the mid-1960's but they are only compatible with the D40x and I know I don't really like that camera). So I'm starting from scratch basically.