Need guidance on setting FSM parameters

Can anyone point me to a "recipe" for setting the max_fsm_* parameters?
Something at the level of

 Run 'VACUUM VERBOSE your-biggest-table-here'
 Look at the nice number
 Calculate a value
 Stick it in for max_fsm_*

I'm running with the default values, which I know aren't good, but I
don't want to just stick '100000' in (as many have recommended) without
knowing why that number is better than, say, '150000'.

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Jeff Boes                                      vox 269.226.9550 ext 24
Database Engineer                                     fax 269.349.9076
Nexcerpt, Inc.                                 http://www.nexcerpt.com
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