Chinook is also a great one...
But out of the Police and Millie I would have to say Millie. I just got one recently, first one I've owned since the very first models were released and its hard not to carry it.
As many here have said and will say again, the cutting power in such a light package is hard to beat! IMO the handle could be a few mms shorter and that would just about make it the perfect knife.
Well, OK tip up would be nice as well...
I have the S30V version BTW and it is a cutting machine!