Can you test them out? I don't know the NECs but the older NAD decks can still sound quite good (I have a 5240). I also have a Nak OMS-2A. It is a little cranky. Left un-played for a long period of time, I was getting some channel distortion, but that went away over an hour or so and then did not return. Sometimes it is finicky about what disks it reads. The sled was reversing when I put a disk in but then that problem went away as well. The older DAC tends to accentuate higher frequencies to my ear, but still sounds good overall. The build quality overall is good, though, and it's very nice to have the headphone jack and volume control for direct listening. If you can test the Nak out and it works well and still sounds OK, it's a good buy for that price, that is about what I paid a few years ago. My favorite vintage CD deck is my Marantz CD-63 II. If you ever see one of those, go for it.