Do it the scientific way:
1. Your boot partition will use FFS and will be <4GB
2. Half of your other partitions will use SFS.
3. The other half will use PFS.
4. 1 year from now when 1 of your partions explodes, or files or dirs mysteriously vanish, come back and tell us which partition it was.
p.s. Make sure you have 2 small partitions for your Ibrowse cache. 1 PFS and 1 SFS. You don't want to lose an important partition just because the cache went to the far side of wonkyland.