I've only seen the one ending (the 'happy' one I think cos I saved all the little sisters) but I won't be playing it again in the near future.
I have patched the game though, FWIW.
Have to say though that I thoroughly enjoyed it while it lasted and it is a brilliant game.
I've found that I've often regretted selling off some games and think I'll hang on to Bioshock, I may just get a hankering to play it again in a year or two.
Right now I've really got a yearning to play Little Big Adventure 2
I loved that game, never did finish it and sold it

I managed to get a copy from an abandonware site but it won't run, even in Win 98. I think it's either corrupted or it needs Win 95, which probably means I have no chance.
Unless I load Win95 into VM Ware, hmmm...
I think I still have my set of floppies with Windows 3.1 and the Win 95 upgrade CD.
Anyway *cough* I'm waffling - Bioshock