[Audioarchivist]

I can't stress this enough - adjusting the azimuth (tape head alignment) is critical for good sound!
I find many tapes need specific re-adjustment for proper transfer. It's not a set-it-and-forget-it type of thing!
Whatever brand of deck you get, make sure you have access to the screws that hold the playback head when the tape's playing. Whether there's a tiny hole in the door or the door can be removed or in a few cases I've heard of decks that have some kind of adjuster built-in (very rare!)...

Get a precision screwdriver and listen in mono. Turn one screw (usually left side one) back and forth maybe half a turn each way and listen to the music you wanna transfer. It'll "brighten up" when it's in alignment.

Also, a good soundcard is essential. Stock built-in computer sound is shite, but you should know that already!

Good luck and happy mastering!