Get one with a remote microphone jack and a tape counter.
The recorder can be connected to an inexpensive handheld microphone with an On/Off switch on it. This allows the control of the recorder without having to constantly start and stop the machine with the buttons. It seems to be easier than the controls on the machine that many microcassette recorders use, as well.
The tape counter allows for note taking by simply writing down a topic and the counter number. This allows review of information quickly without having to relisten to the entire tape.
A simple foot pedal switch available for under $5 can allow the tape recorder to function as a dictation system, and leave the hands free for typing.