I'd go for 1D Mk II, I am using 5D and 1D, but enjoy the 1 D more for what I enjoy shooting....action and streets, eventhough it is just a 4MP Mk I version. So its a matter of fun or bread and butter issue for me.....5D photos is great for events that justify the money, a much more economical option than the next step up in FF on Canon range.....1D is for fun....hope to upgrade to at least MkII in the near future, as photography is my main indulgence in life.