Bought Snow Leopard today for $32 from JB Hifi (negotiated on price here!) and it's pretty good. My 20" iMac (Core2 Duo) feels a lot snappier but from what I've read on the net it's not truly 64-bit. Meh, either way it feels better.
That, and I got 23.46gb freed up (from 187.85gb in Leopard to 211.31gb in Snow Leopard). I used CUSTOMISE INSTALL and unticked all the other language options apart from English and Simp/Trad Chinese... but I did tick the Rosetta option (for compatibility) and also left the default printer driver options (for popular models).