Does anybody have any idea how these two receivers stack up against each other? My most important criteria would be performance as a preamp for 2-channel stereo (I have separate monoblock power amps for the front two channels and will use the receiver's pre-outs for that purpose). Home theater performance is also important. The Marantz has more powerful amps, but my room is not huge and I tend not to listen at great volume. Any views on other aspects of these two receivers' performance would be gratefully received (even such things as the quality of the built-in tuners or headphone amps). Thanks.