Maybe...just maybe, this is a serious question from someone that has more money than they know what to do with. In the spirit of this being a serious post here my take on it.
Quite honestly, and it was said earlier, if you are asking these questions you really aren't ready for the 1DsMKII. I would agree with Dante (did I say that) that the tools will make you better to a certain degree. You could give me a set of 7000.00 golf clubs and I'd still be a lousy golfer. I may shave a few strokes off my game but at the end of the day it lies in the talent.
I am thinking of buying the 1Ds Mark II thinking more expensive camera, more options, better pictures.
This is seriously flawed logic. More options can certainly equate to better images to a certain degree and it can also lead to more confusion (especially to someone who admittedly doesn't know that much about DSLR) which can lead to a disasterous final product. Owning the top of the line Canon DSLR is not going to guarantee you a happy bride and groom when you give them your shots. If you are pixel counting why not get a medium format camera with a Phase One back.
Have you spent any time in the wedding forum here. There are alot of very good photographers turning out excellent work with anything from the 10D upwards.
I have printed images from a 8.n sensor up to 24X30 and the quality was very very good. Pixel counting is not the best decision making process. I would guess that if you are going to use this camera for just weddings that you will not be able to exploit its full potential. You've said that it was going to be an outside wedding, what about flash, do you have the understanding of how to make this work for you in an outdoor environment.
Your post makes me almost believe that I have bitten on a baited post but so be it. You haven't given us much information to give you really good direction. What lenses do you currently have, what else do you shoot, what is your experience level (beyond what you have already told us), do you have a website for us to look at. So many questions.....
Good luck.