The wiring/connectors are pretty much exactly the same for Monsoon vs. non-Monsoon... the only different is that the brown connector serves up amp-ready line out level signals in the Monsoon configuration, and already amp'd speaker level signals in the non-Monsoon config.
There is virtually no retrofitting involved in updating a 2000 headunit with a 2005 headunit... as long as you stay with one type or the other (update Monsoon decks with Monsoon decks, non-Monsoon with non-Monsoon). The connectors are plug-and-play. The only retrofitting you'll have to do is routing and mounting the aux in jack.... and routing the satellite antenna, if you go that route (which will actually be the toughest aspect of the whole project).
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