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
TDK tapes always ended up stretching the few time I tried them. Maxell UDXL-II and XL-IIS were my favourite by a landslide. TEAC cassette reel to reel tapes performed admirably also, but weren’t as readily available as the Maxell tapes. 
I’ve got a Sony TC-K570 3 head deck bought in the mid-90’s which I’m amazed with how good it sounds. Previously it was a Technics RS-M234X 2 head deck with dbx that performed flawlessly. I never got around to trying the Sony with my dbx 224 encoder/decoder but when I eventually do, I believe it’ll be utopian. 
Holy Moly!
You had to have dropped some serious coin for that!

Nearly the Holy Grail!
Roughly seventeen hundred, WH repair was about seven fitty, so I thought I did pretty well (hope so).  They do seem pretty rare.  The main thing is to have it gone over.  I guess this one is the "recording champ" with the Dragon the "playback champ"?