I think I am leaning toward a 5D for my upgrade. I have used a 10D since near the end of it's cycle, I recently purchased a 350D because the price was right and it has a compact body. I don't think FF is necessarily better, but maybe different. And like Loupey says if the FF didn't have the price differential, and the aps C didn't have the crop and tighter pixel pitch(although I am not totally convinced tighter pitch is a good thing). Would there even be a question?