Step up from Nakamichi 582 tape deck?


Have an option to acquire a very good working order 680zx.
At present have a 582 and was interested if those in the know would consider it to be a worthwhile upgrade?

Or would I need to go even further up the food chain? Zx-7 or 700zxl or?

I have just purchased a massive lot of tapes at pennies per tape so do not foresee me forsaking this medium anytime soon .. Lol.
128x128uberwaltz
The ZX-9 arrived.  Me, too stupid to know to push that Azimuth button, didn't.  Willie Hermann is a gentleman, and didn't call me stupid.  There really are a lot of buttons and stuff to learn about on this machine, meanwhile it really does sound pretty amazing.  I made a short tape and pretty impressed. 
Well the zx7 arrived today and what a machine, I am sure they landed a man on the moon with less computing power and switches than this deck has!

The 660zx was a nice step up from the 582 indeed.

But this is in another league entirely.

Playback is extremely detailed, maybe not quite as much bottom end as the 660 but a lot more air and detail .

Very happy so far ,next up will be plopping in a TDK SA, setting azimuth for that tape and make a recording from Qobuz hires.
This morning I finally took off those little cap thingies and sat down and perused the setting procedure.  It is a bit daunting but kind of fascinating too.  I felt like I needed some adjustment recently when source started sounding noticeably better than tape.  Time to do a demag and start messing with this machine in earnest.  First I should read this manual which isn't easy because it's written in Japanese American.  Good for a few laughs though.
Hi everyone, what would you say market value is for a Nakamichi DR -2 in near mint condition and completely shopped out week by a qualified repair center?

I’m thinking of selling it. Beautiful cosmetic and performance condition.Dave