Its time to trade in my film EOS500 35mm SLR. Im looking at the EOS400D and the D40x. From what I've read, I suspect the D40x just has the edge. I'm wondering whether I could usefully re-use my EOS lenses (EF 35-80mm & EF 80-200mm) with the EOS 400D and save money by just buying the digital body? Alternatively, can I re-use these lenses with the Nikon D40x - is there a converter? Thanks