I want to move from aps-c sensor to fullframe. However, I don't have the cash to spend a whole lot of money on camera body as my priority is buying lens. I have a canon 60D and thinking about selling it and getting a 1Ds mark ii and/or 1D mark iii. I know their limitations in terms of ISO performance but I will primarily be using the camera for portraits with and without off camera flashes. Feedbacks are much appreciated.