Hmm, decisions, decisions... I think I'm going to go ahead and pick up this new set unless I see the 2003 box set on sale for cheap. (yeah right) Plus, I have lots of access to the 2003 box set so if I ever want to view that bonus disc, it's easily available.
Too bad there's no cheap way to get both box sets and find someone willing to buy 2003 movie discs in the 2008 box...