Upload & Sell: Off
@taylorman: 5Dc over 40D/50D definitely. If you prefer it over a 60D depends on your priorities. The 60D has a modern sensor, lower noise levels than a 5Dc. But it's not Full Frame so it's not for me. But it has video, live view, larger LCD, modern menus etc.
I have shot years and years with a 5D, used it for paid work, nice portraits, etc. If you can do without the modern extra's, it's still a great performer and well, I just love FF cameras.
@ISO1600: there's more to deciding between cameras than depreciation. Still I would gladly spend a couple of 100 more to get a 5DmkII. With video, Live View and MA, modern menus. And of course 1 stop better high ISO noise performance and 21mp. It's worth about $500, not more. When the 5DmkII came out in 2008 I decided I would not buy it new because it wasn't that much better than the 5D to justify spending 1500 extra. Now that the gap is much smaller, I decided to go for it. I'm not sorry I did.