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Pre-dirt I would want a trem that goes to off, so I'm going to say the Zvex Sonar thing. Which I've never played, but anyway.
I didn't like the Cusack, as mentioned before, for the same reason. Something just felt... boring.
I Diamond Trem was nice but also a bit like the Cusack, a little stale.

love the Empress Trem and the Dr Sci Trem.

I've got an EQD Hummingbird (older version) that is killer but the power filtering is total shit and it introduces a lot of noise into your signal which drives me batshit. Even on isolated power it can be finnicky, though I don't know how that is possible. Maybe the latest version is better. But that is one of my favourite sounds.

Fairfield Randy's revenge is also a crazy nice lofi trem. If I wasn't using distortion ever then this would be my favourite.

I've only had two (technically still have two until I get around to selling the first):
Walrus Audio harmonic tremolo - never could dial in a sound I liked
Basic Audio Throbby - dumb as hell, can't find a sound I don't like

i got a catalibread pareidolia. it is a sort of harmonic tremolo
based on the trem of a '60 fender twin i believe
it is a pretty low key effect, not really suited for a typical tremolo role

[youtube]http://www.youtube.com/watch?v=7xa9hzGyK8Q[/youtube]