Depending on future usage of the equipment, I would either buy a Canon 5D MkII or a Nikon D700 (for the advantage of having full frame for the wide shots) and rather than a 24-70, I would go with the 17-40 f4L for canon, or a similar Nikon lens. If it is pretty much for a one time use, I would be tempted to buy a rebel (you could get a 50D, but for the job you mention there wouldnt be much advantage apart from build quality, unless you want to crop an image severely)and the 10-22mm lens. I am sure Nikon would have a similar lens and body if you wanted to go with Nikon. You could also buy a nice longer lens (or 2) for other landscape opportunities that a wide angle may not suit, perhaps a 50mm 1.4 or 1.8, and the likes of a Canon 70-200f4.