Repair Disk: Use original Leopard disc or my Snow Leopard upgrade disc?

Not sure which to use before I try it. I'm currently down to about 4 gigs on my ~ 325GB system drive. I also have a 3-disk 1.5 TB raid with about 400GB free. Note: I can delete stuff from both - I will free up space on the system drive but I ran the Verify test just to see what was up and this is what I found. Wasn't really having a lot of big problems, though performance does seem a little slow. Thanks for any help.
Verifying volume “Macintosh HD”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Missing thread record (id = 14709354)
Incorrect number of thread records
Checking multi-linked files.
Checking catalog hierarchy.
Invalid volume file count
(It should be 910733 instead of 910746)
Checking extended attributes file.
Checking volume bitmap.
Checking volume information.
The volume Macintosh HD was found corrupt and needs to be repaired.
Error: This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk.

Scott,
I would use the SL disk to run DU. The SL version is more current.
Regards

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