The best safety I think I've seen is Will Barkley in the Jack English draft. He's about as big a hitter as you find at the safety spot and he can cover.
In the Jack English draft tree (I think it was), 2nd or 3rd year in, there was a safety named Prince Justin. He is a high 80s potential, solid guy. His blessing is he has some crazy high catch rating (80s maybe). In ONE game agianst the 49ers, he had FOUR INTs for TDs.
The Zazzali draft path has some serious freakish athletes. As for safeties...
Spoiler
I am biased towards Jerome Bartell...he is a great all around athlete (he's a SS) and he is in the Zazzali draft class...usually goes in the first 15 picks. The year after There is Tyrus Barber (FS) who is compared to Brian Dawkins...I still have yet to see a safety who hits as hard as that guy.