I have a Denon 3910 universal player. I bought it used about a year and a half ago for $650. They are currently going for around $400 used. It is really a nice piece of gear. Heavy and good build quality with more features than I'll ever know. I also own a Pioneer DV563A bought around the same time for $80 used. They are less than that now. It works great, and you would be hard pressed to tell the difference in sound quality on playback between the two. I've also owned a Pioneer DV45a that was somewhere in the middle, pricewise. They are all available on ebay and audiogon......
The formats mentioned are in the niche market, except I think in classical music where there are hundreds and hundreds of releases, and more coming all the time.........mostly in sacd.