Tenerifepaul-
I'd still look for a quality sub-it makes quite a difference with movies, if not necessarily for music. I'd also recommend that you think about a 2 channel amp (200w min) for the 803 fronts. IIRC, the SCM1s are bookshelf sized, and you can drive them (and the center) comfortably with the 3805's amp if you're not trying to push the fronts as well. You know, the 700 series has almost the same performance as the 800s and they're a bit more affordable, too.
By the way Kode3, the Denon 3, 4, and 5k series decks function pretty well as a pre/pro: perhaps as good as most of the entry level offerings. Frequently, they often have other features you don't typically find on the more affordable pre/pros, as well as an onboard amp for driving additional surround speakers if necessary.
Bryan...I've given this a lot of thought...