A simple question. I'm fancying giving FF a try, so it seems to be a choice of a used 5D or 1Ds. Anyone used both and can give me some hands on advice on my choice. My lenses are a 24-105L and a 70-200 2.8L IS, along with a Sigma 10-20. These are used on a 50D which I will be keeping, so I will also need a wide lens for FF. Any advice will be most welcome.