I also have the 3803; I'm using 5 older Acoustic Research that I've had for about 10 years. The first new speaker set-up that I'd listen to are the PSB Image series. Fantastic range without over-emphasizing any one frequency area,similar to the Paradigm line. The performance-to-dollar value on the PSB's is one of the best for any speaker line.
Chose Denon 3803..now for speakers
After listening to many receivers I ended up liking the Denon 3803 the best and am now looking for speakers. I am mostly an HT person but would really like to listen to more music with some that sounds enjoyable. I listened to the Sonus Concertino and Vienna Haydn at tweeter and really liked the sound of the Concertino on the 5803. Am I goign to get that same sound on the 3803... any other suggestions would be appreciated because I also like the Vandersteen 2ce, Paradigm 60, Klipsch RF7.....