What about a clearly deliniated box with 5 items: 3 with 0 upvotes, 1 with <10 upvotes, and one with more than 10 but not enough to hit the frontpage.

That way there's always something interesting in the box, and everyone is encouraged to contribute to arbitrating the new posts a bit more.

edit: I guess posts that are upvoted should have a significant higher exposure, to reward them with a better chance of hitting FP, so if there's too many upvoted posts it could be 2-2-1. Oh and of course there should be a profile checkbox to turn the whole thing off, wouldn't want to impose ourselves.