Doug,
If you can get past the 80s styling, the Testarossa is a helluva good deal for $60k. Low bucks for a 12 cyl Ferrari... it just doesn't get any better. But... and its a big butt... the maintenance costs on that car are absolutely outrageous. If you end up driving it, you better have $10k a year or so set aside. As far as depreciation, I can't see the car dropping much lower in value. You should be able to pick up a sub-10k mile car in the 60-70k price range without too much problem. These cars rarely have miles on them due to the maintenance costs.
Go here to talk to Testarossa owners:
www.ferrarichat.com
Let us know if you get one!