Opus One, for instance, tastes great, and it is fined and sterile filtered (as are ALL prominent commercial wines)
If Opus sterile filters then I wonder what they are considering "sterile" - the most recent (2001) I've had was noticeably bretty.
Mark, I don't think you should avoid fining if it will improve your wine, there are fantastic wines that are produced with and without fining/filtration. But avoiding these steps simply to boast is cheating yourself of drinking more pleasant wine.
BTW, one could centrifuge and still label "unfiltered", but centrifuges tend to beat up wine more than any filter would. Also, there are wineries that label "unfined/unfiltered" and add DMDC (velcorin), a perfectly legal additive which sterilizes the wine and after 24 hours breaks down to harmless levels of CO2 and methanol. So just because the label says "unfined/unfiltered" doesn't mean your getting a more "pure" product.