Before getting a Kodak camera, I would look into the issue of noise. I'm not talking about shadow noise, but the weird colored noise you get with specular highlights. This is occasionally a big nuisance with a 1ds and I understand that it's much worse with Kodak cameras. If you shoot things with water, ice, or snow, you're apt to see this if you're shooting more or less into the sun. It can be somewhat controlled by NOT shooting to the right of the histogram (or bracketing and blending) for certain subject matter and it can sometimes be fixed with tedious Photoshop diddling, but I certainly would not get any camera that is known to be particularly prone to this type of noise.
Maybe 1ds will get down to affordable levels for you once 1ds2's become a little easier to find and D2X is really happening. I'm keeping my 1ds kit, but also buying D2X. I suspect a lot of people will bail on 1ds and buy D2X, however. I can't imagine a better camera bargain than a 1ds if they get down to around $3000 or less.
The trouble with 20D is that sooner or later you'll be wishing for more pixels. That's always true, of course, but with a 1ds and good lenses and careful technique you can print up to 24x36 with very decent sharpness. For landscape shooting (if weight is not a big issue) 1ds is still an excellent camera, even if 1ds2 has some advantages (esp. less noise at higher ISO). I'm only getting a D2X because of the weight issue.