Davidnboone, if you are doing cassette you will have to find a machine and get it refurbished. Pioneer made some very interesting high-end machines that used Dolby S about 20 years ago- very nice sound, very quiet. Otherwise a Nakamichi is the thing. Nakamichi parts are probably getting a bit tricky as they have been out of business for a while, but you can get belts from Russell Industries. They also can refurbish old idlers and the like. They bought out the old Projector-Recorder Company. Here's the link:
http://www.russellind.com/prbline/index.html
http://www.russellind.com/prbline/index.html