I was going to buy a Denon 1804 which is only available (at list price) for $550, but just noticed that I could get the Denon 3802 (at a sizable discount) for $650 from an authorized online dealer.

Why is the 3802 on sale and not the 1804?
Is the 3802 a much better receiver?
Is it worth the extra $100?

Thanks for any help you can give me.