Just surfing through all the classifieds for used amps and I was thinking, does a good amp ever go out of style? I mean how much has amplifier design and construction changed over the years? The reason I ask is that I see some amps on the used market that had an MSRP of over 3 or 4 thousand when they first came out and can now be found for less than half or more of their original cost. I mean it's not like they sounded like a $4K amp before and now don't? If I were to plop down $4K for a brand new 2004 model monoblock or stereo amp, I'd expect it to be one great sounding piece of work, and in ten years, despite whatever new gadgest and gizmos are out, I'd still expect that the $4K amp that I bought today to still sound great, right? So shouldn't that same perspective hold true in retrospect? Wouldn't I be better off spending $2k on an old amp that cost $4K when it first came out some years ago than I would be when buying a brand new lesser brand or model 2004 amp for $2K?