Some more information would be helpful for us to give you some advice. First, do you find yourself technically limited by your camera? Or are you just thinking because you have some cash you should get the latest and greatest? The general advice most often given is get better glass rather than replacing your body. A fantastic body with some crappy glass won't give you the images you think you might get. But a great lens on a decent body (and virtually all bodies these days are at least decent) can improve your image quality (which can be somewhat subjective) quite a bit. If you think you want to make photography a long term serious hobby, I'd look at Canon L series lenses, although there have been some recent releases by Sigma and Tamron which provide quite good quality at a significantly lesser price than Canon L. In the case of the new Sigma 35mm, it actually is optically better than the Canon 35mm L.