So, I've been on the hunt for the past several weeks for a nice 20D. I was under the impression I could score one for around 600-650 used, but more and more, its appearing thats not the case; instead, they're going for more like 700-750 or higher used.
Meanwhile, I've been watching 30D's sell like hotcakes around 850-900 used.
My question is this, what are the differences, major or minor between the 30D and 20D, and are they worth it for the extra 200 dollars or so?

