Ever slipstreamed? You can get SP3 at the very least, SP4 if you're feeling adventurous or masochistic. Take your pick.
Anyway...are you slipstreaming the Multi-Language stuff on top of the normal installation? Can that be done?
What I've done is slipstreaming an SP3 disk with quite a few updates (SP4 doesn't seem to play nice with our database server at all, no clue why), and after installing that, I install the MUI for the OS, then Office, then the MUI for Office. This is all for our Japanese users.
What steps are you taking?