I swear by the beananimal. I've had a couple of times where that 3rd drain line has really saved my butt. It's dead silent and super easy to use.
As for teeth versus no teeth... I did an external overflow with my tank, but there is an acrylic backing to black out the tank of the tank, so I had the option to do both. Ultimately I went with no teeth as I prefer the clean look, the absolute silence and the awesome surface skimming. Now, with that said. I have had a couple critters go for sump rides because of it (though I could put strainers on the drain lines).
What style of overflow box are you thinking of? I think that would weigh in a bit in which direction I'd go.
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