The MDF3 will work fine; you may be able to pick up a used model on ebay or sweetwater.com - but just to whet your appetite, check these out:
http://www.bck.co.uk/htm/okyweb.htm http://www.bck.co.uk/htm/m88.htm The OKYWEB uses SmartMedia cards and the M88 uses 3.5" floppys.
I haven't seen or heard one, but a discussion thread a month ago turned these up. Very interesting alternatives.
Cass
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Cass Pawlowski - Motown
PSR2000, SC88, Cakewalk