knolbrent, back in the '70s and '80s I owned a number of cassette decks. They included Nak, Tandberg, Harman-Kardon, Aiwa, Pioneer, and Denon. Because of the time interval my comments today must be only general terms.
First off, beware of prerecorded tapes you may find in used record stores and thrift shops. Even brand new and undamaged I always found tapes I recorded myself were of better sonic quality. A main reason was likely the high speed duplication necessary for volume production. And at the time cassettes were the #1 sellers.
Nakamichi has become the standard "go to" brand and with good reason. They were well designed and built. But they were complex and are now old and the average electronic repair person may not be able to update them properly so be prepared to find a specialist if you buy one. I owned a 480 and found it only "average" so I wouldn't pay for the name there. Spend more and find something higher in the line.
The "sleeper" among those I owned was the Aiwa f990. It was not so well known then but now I see substantial prices for refurbished examples.
I still have a good collection of tapes and a Pioneer CT-900. That is also a very good deck but mine has a broken belt which is a pain to replace and not high on my task list.
Anyway, with proper selection of blank tape and careful recording procedures you may be surprised by the sonic quality you can enjoy.