IME, your best bet is an Otari MX-5050 BII2. Plenty of them available for well under $1,000. This model will have 2-track record/play and SHOULD have 4-track playback. It plays small and large tapes at 3 3/4, 7 1/2 and 15 inches per second. It is a professional deck used by the thousands in radio stations and studios. It is rugged and sounds better than consumer decks. A brand new one (Model BIII) is available at something like $5,500 but will not play 4-track tapes unless specially equipped with a 4-track head. Otari makes an outstanding machine. I had a well-respected Teac X1000R and it couldn't hold a sonic candle to my Otari.
HOWEVER.
Many or most of these decks have been played to death, and look it. Replacement heads are not cheap. Repairs are not inexpensive. Finding a great one is not easy. But they're out there. Good luck, Dave
Note: Otari called many of their models the MX-5050. The nomenclature is confusing, but the one I cite is the most commonly available and your best bet. Again, though, you must be sure it has a 4-track playback head. Most of them do, but not all.