How to change the default location of 'Music', 'Pictures', etc. in my home folder?

IMAGINE I have 2 hard disk partitions on the SAME hard disk,
one is called 'Macintosh HD' and the other is called 'My Data'.

The Plan:
In the 'Macintosh HD', there are (1) system files & (2) users' settings.
In the 'My Data', there are all the music, pictures, etc.

For example, the 'Macintosh HD' has 40GB and the 'My Data' has 120GB.
All I want to do is to separate the SYSTEM and my DATA without migrating my home folder inside 'Macintosh HD' which contains folders called 'Music', 'Pictures'... to the partition 'My Data'.

I want to separate the system files and my data incase I need to reinstall the Mac OS X while leaving all my data untouched.

So the way I should do (I guess) is to leave my home folder inside 'Macintosh HD' empty,
and create files called, for example, 'My Music', 'My Pictures', etc. in the 'My Data' partition.
Then redirect the files 'Music', 'Pictures', etc. in my home folder inside 'Macintosh HD' to 'My Music', 'My Pictures', etc. in the 'My Data' partition.

In Windows XP or Windows 7, you can redirect those as using the methods below:
(1) http://i41.tinypic.com/2rorkhx.jpg
(2) http://www.sevenforums.com/tutorials/18629-user-folders-change-default-location.html

But I just don't know how to do that in Mac OS X, it seems that Mac OS X doesn't even provide a way for users to do so:
http://forums.macrumors.com/showthread.php?t=336192

I saw a reply in macrumors forum and tried to move the 'Music', 'Pictures', etc. folders,
but it turned out that those files were being copied, not moved.
So I can't move the 'Music', 'Pictures', etc. to the partition 'My Data' and make aliases of them which can be put in my home folder inside 'Macintosh HD'.

So, are there only 3 options for me too choose?
(1) stop trying to fight Apple and Mac OS X on where it puts things, just put all the things in my home folder inside 'Macintosh HD', using only 1 partition
(2) move my home folder to the other disk partition, in this case, the partition 'My Data'
(3) can't redirect the location of Music', 'Pictures', etc. folders in my home folder in the 'Macintosh HD', but just simply put things in the 'My Data'.

Thanks in advance!

 

Thank you spinnerlys & NorCalLights!
Lesson learned: symbolic links

It seems that I'd better stop trying to fight Apple and Mac OS X on where it puts things,
as Time Machine / Carbon Copy Cloner / Disk Utility are good ways for backing up files.
Just spend more time doing what I want rather than configuring the computer!