Parts availability of old Nak 480s/680s/700s etc. is bleak, and their electronics were pretty noisy. Later BX-1s and BX100s were better, but there's that silly rubber idler for the wind/rewind hubs that always goes bad.
But the Nakamichi CR-1A/CR-2A is are great two-head decks, and made after they switched to gear-drive for the wind/rewind hubs, so very reliable. Even better are the Onkyo TA-2600 and TA-2800 . . . they're three-head models, but use a "sandwich" type P/R head. The mechanicals are actually identical to the late two-head Nakamichi like the CR-1A, and electronics are very good.
The mid-1980s B&O decks are actually quite good as well, (i.e. Beocord 5000 in a drawer, or the Beocord 2000 top-loader), with simple, reliable mechanisms and excellent electronics (after all, HX-Pro was their circuit, which they licensed to Dolby). They can be had for a song, and will usually come back to life with just a capstan belt, a good cleaning, and a DIN-RCA adapter. Operation is a little "different" (i.e. record monitoring has to be done through your preamp, not through the deck).