I'm no expert but Devin White (RB-LB out of Louisiana) comes to mind. 6', 260 lbs has been electronically clocked at 4.55 in the 40. Runs like he's angry. Very, very impressive. Could also be a real thumper at ILB.
A very physical guy on both sides of the ball. I can't post a link but if you go to www.youtube.com and punch in Devin White, you'll be impressed.