We actually have an entire draft section for stuff like this. I think this thread will be moved there, eventually. Good idea for one though.
http://packershome.com/index.php?name=ForumsPro&file=viewtopic&t=6698 As you see, a lot of mocks have Charles Brown available around pick 15. If he is, that'd be a dream come true. That's my dream selection if we do pick around that spot.
Not that high on Bulaga. I think he'd be a reach at that point, like you said.
If Charles Brown is gone and we pick at 15? I have no idea, really. A lot of the DE/OLB prospects seem like reaches at that point.
Maybe we could go CB. Either Joe Haden or Donovan Warren should be available at that point. If the kid we pick at that point works out, we'd be set for another 6 years, barring injuries, when Woodson and Harris retire. Having Williams and Warren/Haden out there.
Of course, we could always trade back, though. From 15 to 20 might net us another 3rd round pick and we'd still be able to pick up a 'solid' tackle in Bulaga.