Hi. I've only heard 1 SLI-80 and it really is a fine piece of equipment. I personally own an SLP-50B pre-amp and am very pleased with the performance, however, I have had the caps upgraded by Cary. I've never heard the CAD-50 mono's before so I really don't know anything about them. I this person is wanting to upgrade for the sole perpose of sound quality, tell him to start by upgrading his cables, including power cables. If this person already has top-notch cables about the only thing the upgrade you are talking about will do is make his system image better and have better soundstage. I believe that I would start with cables and go from there. For interconnects, I HIGHLY recommend the Straightwire Crescendos. Please feel free to e-mail me if I can be of any further assistance.
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