That's what I love about this forum. Two years ago, I didn't know anything about Sonic Frontiers, even though I had been buying DIY parts from Chris Johnson for years. I certainly didn't know about the SFD-1 & 2. And now I play my SFD-1 everyday in my office rig. Until a couple of days ago, I didn't know about the Processor 3. I guess I need to do more reading. @dankef, I have no idea what a good price would be for the Processor 3, although the "sold/expired" tab on a hifishark search might give you some idea. It certainly is a nice design and should be a step up from the SFD series. Of course, synergy counts pretty heavy, so you don't know how a technical upgrade changes the character or synergy, but it would be an interesting listen. If you get a chance to listen to it, I hope you will share your impressions.