i will tell you this. if you are going to get a 5d II, then don't even bother trying out a 1D series camera. Once you see what canon's AF system is capable of and aren't using it, you will be highly disappointed.
+1 - but i think the Op wants a 1 series so I say get 2 x 1dsmk2... thing is that no a lot of people have had access to the Ds series and as such they have never been talked alot when it comes to high iso - there is no way that mk3 or 2 will dissapoint a 5d or 5d2 user.












