The most important consideration for a cassette deck used for archiving master cassettes (Don't know if that is what you are doing) is the ability to control the head alignment, or azimuth. The Nakamichi CR-7 and Dragon are the best cassette decks one can use for this purpose, unless you have access to the original deck the tapes were recorded on. Azimuth adjustment allows you to perfectly match the playback tape head with the recorded portion on the tape. Slightly off, and it will not be as clear as it could be.
I know there were other machines made that had azimuth adjustments, although some required using a small screw driver to turn the head adjustment screw, and you need an alignment tape to return the playback head to it's correct alignment with the recording head, in the case of 3 head machines. I think that Harmon Kardon made one with this adjustment also, back in the late '80s.
Good Luck! I have about 2500 cassettes, more than half being masters, and I abandoned the notion of trying this because I cannot even get momentum behind the project of transfering my 1000+ DATs.