I use ReiserFS now, best thing I've done for my suse stability.
Used ext3, it actually gave me less total free space (vs. reiserfs) after 2 separate identical installs.
Used XFS on rh7.3 , result unstable. may try again.
BeFS deserves another look, I briefly tried it once.
Waiting for IBM's JFS to mature for suse.
so any or all of the above would be welcome IMHO
