Agreed about the 80s Denon stuff. I've had a stack of Denon gear since I bought 'em new, and they still sound good ...heck, with the right speakers, VERY good. Any of their larger (usually gold, occasionally silver) amps with the wood-slab sides from that era are good; the bigger the model number the better; the monster-sized ones sound best. The later black (or gold) monoblocs are good, too.
I forget the model number, but there is a large black Marantz set-up that looks like separates but is actually in one case, which has high specs and very good sound. I think it comes from the late eighties(?). It has been written up here by one or two members who have it, so a search may turn up the model number.
Luxman's R-117 reciever (tuner/preamp) with the M-117 power amp (200 wpc, I think) is a great pairing, too, but I'm not sure when it came out. I THINK it was from the eighties.
If you are looking for affordable good sound, pick any of these (or other top-of-the-line gear from the era) and enjoy your cheaply-bought sound.
But if your aim is to save money and "jump the gun" on the next wave of collectibles that will appreciate, you could also try getting the less-appreciated or second-tier "sleepers" from the seventies, or even boomboxes, which already get surprisingly high prices on eBay for the rarer, bigger models but can sometimes still be found cheaply "in the field".
Generally, as the best things become too costly, the next-best things rise to take their place. Once art prices reached a point where no one who wasn't a billionaire could collect old master paintings, first romantic, then expressionist/impressionist paintings took over as the "hot" collectibles, and that cycle has repeated itself several times over since then. These days, modern "garbage" art can command high prices that would have been unthinkable back when real art was affordable!
But there is both supply and demand to consider. The supply of 80s stuff is greater, but will there be the same demand for it? IT had nowhere near the same build and sound quality of the seventies stuff: if it did, we'd have more people talking about it here on AK, too.
Nostalgia also plays a role. People of a certain age collect seventies gear in part because they remember the time when a home stereo was important, and they remember drooling over the ads and showroom displays of the "receiver wars". The equivalent ICONIC audio of the 80s, which probably best reminds people of a slightly younger age of that era, was probably the emerging pop-culture symbol, the boombox, not the fading home stereo. Hence, there are now collectors of boomboxes out there bidding the best ones up on eBay [so far, up to US$2,000 for a mint-condition JVC M90]. ...but the ordinary models that lack the "icon" status, like the run-of-the-mill/mediocre home audio gear from the same era, still sell for peanuts, because of greater supply and lesser demand.
Of course, there are always early model iPods or walkmans or video games or computers... or going back earlier, portable transistor radios, but I wouldn't recommend going those routes, as they may never go up much (?). Not everything does.
Anyone want to start collecting mobile phones?
