Listening to this thread, I'd say the first problem is to idenfify
the requirement. What users will require signals to be brought off the
board, and what will they want to accomplish? If that question can be
answered, it will be a lot easier to decide what connector types to use,
what set of signals to bring out, and whether to add buffering and/or level
translation on-board.
Nothing says there can't be more than one connector, either. You
might want unbuffered PMC for speed using piggyback boards, and buffered
0.1" headers to bring out lab test points. You might want your sacrificial
buffer ICs in sockets, too -- although nowadays there are some really small
SMT TVS diode arrays that can protect them against ESD and surge.
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