On your program on 1/23/10 you showed a variety of insulations and a suggested vapor barrier. Living in Ohio and dealing with the change of seasons instead of a plastic vapor barrier that often gets punctured trying to remove or stack something in the attic and before long it starts to fall down. Will peg board still give enough breathing room and keep the insulation intact for many years.
Howdy plastic is a vapor barrier peg board is not. You might consider using a vapor barrier ceiling paint below the attic instead and sealing the ceiling light fixtures with caulk instead.