I have to disagree with Psjulian, I find Levinson gear to be too polite and uninvolving with the B&W Nautilus series. Intellectually I understand it but it does not pull me in and make me want to listen to music. As far as integrateds go the Musical Fidelity Tri-Vista/Nu-Vista integrateds work well with the N803 and I have been told that the BAT integrated also is a good match. I have yet to hear an integrated that can really complete with descent seperates (I've been told that's why Pass Labs does not make an integrated).
