The only Sony ES that my local HIFI store sells is the DA1000ES because the other higher up models have had poor reliability. Cnet.com gave the 3805 the editors pick award so whatever that is worth at least they liked it quite a bit. A store called Ultimate Electronics is currently liquidating allot of their stores stock. If you can find a 3805 there they should sell it to you for around 850 US dollars. The sound of the DA1000ES was not in the same league as the Denon 3805 but I have not listened to a DA3000ES.
I have the 3805. Not only was in a CNET editors pick, but also a Component of the Year at audioholics.com. It consistently gets good reviews across the board. The sound is very neutral and clean with just a tad of warmth in the midrange (IMHO). I would not pair it up with bright speakers, like Infinitys, for example. I have heard the 3805 paired with Klipsch Reference, which some consider bright, and found the sound quite pleasant.) I have Axioms and I like that combination. Some think that Axioms are bright, but that is probably when the comparison is made to the titanium tweeter vs a soft dome tweeter.