I HATE ITUNES!

Ok, I got a iMac, and I'm wanting to play the music on my PC via the network off of my iMac.
The first time was easy to add the songs.
But now, every time I update, I need to clear my library and re-add to prevent duplicates.
Is there a music player for OS X 1.3 that allows a "watched folder" that I can have it re-scan for new/changed/deleted music, much like how winamp does?

There is none.  You use it the way Steve Jobs thinks you will use it and it's all good.  Deviate outside of the box and you're shit out of luck.