Never ever ever should we consider taking Redick with the #8 pick. Not even for a second.
He did measure out slightly taller than expected (6' 4.75" in shoes) but he's still well below average athletically for an NBA SG. He'd struggle to guard PG's as well, due to differences in quickness. There's really no way to mask his defensive shortcomings in the NBA, which is why I don't think he'll ever be anything more than a shooting specialist, at least against most teams' backcourts.