Jeff Kelly, Kendall McIntosh, and Darren Howard on the same defense. Goodness, if LHC LHC Bill Snyder was a 3% better game manager he might have had more than 1 national championship.
I can't recall all 11 regular starters for certain, but on that 1998 defense, nearly all of them played in the NFL at some point.
Safeties: Cooper & Chapman (with McGraw as a sub)
CBs: Butler & Carter
LBs: Kelly, Simoneau, Ochs (Leber was a sub)
DL: Howard, Clements, McIntosh, Rowe (Beisel was a sub)