I have both the original Promedia 5.1 gunmetal grey (rebuilt amp by that ebay buy) and the Pre-Amp DD 5.1. Both are in great condition and have been boxed up in storage for the majority of their lives. I am curious as to what the current going rates are these components since they seem to be in high demand and are discontinued. Considering selling them for a fair price since I prefer the mobility of my headphones.