I have decided to switch from an Olympus system to one of the two mainstream systems. I absolutely love Oly glass (this is why I have been holding on to 4/3), but the full frame bodies like the D700 and the 5D II are simply too tempting. My initial plan, due to budget considerations, is to get a crop-sensor body (40D, D200, or D300 - I am *not* considering the 50D, D90, or D80), and then upgrade to a D700, its higher res successor, or a 5D II later. Now I need to decide which lenses I will be getting, and that is where the choice between systems gets tricky. Initially, I want to get a nice "walkaround" zoom. The lens should be full-frame capable (not DX or EF-S), sharp, and reasonably fast. Also, the lens has to be immediately useful on a cropped sensor body. I.e. a 28-70 mm lens will probably *not* fit the bill. I doubt that coming off the ZD 14-54 f2.8-3.5 I could be tempted with an f3.5-5.6 consumer zoom. You never know, of course - I know next to nothing about Canon and Nikon glass, and maybe some of these are excellent! Canon lens choice is more or less clear: if I will be going with a Canon system, the first two lenses I will be getting are the 50 mm f1.4 and the 17-40 f4 L ($300-ish and $650-ish, respectively). With Nikon it is much harder to decide. Did they ever make any affordable, full-frame capable lens that will be comparable to Canon's 17-40 L? Are there any non-zoom Nikon lens combinations I should be considering? Are there any Nikon lenses I should be avoiding like plague?