I've got a real sleeper for your consideration, a small OLB who I think could be the next Darren Woodson-- Jonathan Casillas, from Wisconsin... he's 6-1, 225 pounds, about the same size as Woodson, and runs the 40 in the 4.45 second range, with a reported best of 4.4 seconds... again, that's Woodson-esque speed...
NFL Draft Countdown lists Casillas as their 57th best player, NFL Draft Scout lists him as their 74th best player, so keeping in mind that these ratings don't include underclassmen who might declare for the draft, he's almost certain to still be on the board when the Boys pick in the 2nd round, and he might even still be on the board when they're up in the 3rd round... Eliminating the top safety prospects, who will be gone before the Boys draft, some other safeties that might merit a look include FS Derek Pegues from Mississippi State (2nd round), FS Rashad Johnson from Alabama (3rd round), FS Sherrod Martin from Troy (4th round), SS Michael Hamlin from Clemson (2nd round), SS Chip Vaughn from Wake Forest (3rd round), SS Otis Wiley from Michigan State (4th round), SS Myron Rolle from Florida State (5th round)...
My round projections take into consideration that the Boys will likely be drafting rather late in each round...
I don't have Ellison or Nic Harris on my list, for one reason-- I have doubts that either has the foot speed to succeed at safety in the NFL... either one might be a good candidate to bulk up and play OLB at the next level, IMO...