the 10D is a very nice camera. i could only fault it for it's magnification factor (which is a subjective peeve) and it's "small" resolution (6.3 is definitely nothing to be ashamed of though).
the 1ds is an amazing camera. 11 megapixels, rock solid body, full-frame capture, etc. pretty much everyone's aware of this camera's highlights. then there's some obnoxious things about it like the hard to clean sensor, etc.
personally, i'd wait it out. if you're willing to spend ~$10000 on a top of the line camera, why by one that's replaced 2 months after you get it? even if the new 1d? only has a few mechanical or software upgrades, i still think it would be worth your effort to wait for those benefits than to be ... well, impatient and pass on them.
moore's law is very much a factor when it comes to digital photography, and the 1ds' time as canon's king of the hill is running short. if i were you, i'd stick with the camera you have and rent the 1ds from time to time so you can enjoy the benefits it offers, and save the bulk of your money to spend on the new version of it that'll be even better.