The Adcom rig will wipe the floor with that Harman Kardon in power capability. As an added benefit the Adcom gear will retain it's value. If the preamp has the remote control, that's even better. I wouldn't trade that stuff for the Harman Kardon receiver. The H/K does have a pretty nice set of features for a stereo receiver, such as dedicated subwoofer outputs, main in and outs (allowing you to use it as a preamp or amplifier). It also has digital inputs (not commonly seen on stereo receivers, however it's mostly a useless feature). Another feature that could be nice is the iPod dock connectivity (dock sold separately). Being that I don't particularly care about digital inputs, sub preouts, or iPod crap the Adcom takes the cake here.
As WmAx mentioned above the quality of parts in Adcom equipment is much higher than Harman Kardon's current crop of gear. They will more than likely give you years of service.
