I don't think you use a first or second round pick on a QB, but I wouldn't go so far as to name Orlovsky the heir apparent. I think the Lions should seriously look at signing or trading for a veteran QB. Like Jon Kitna. Make him the starter next year, with Orlovsky backing him up.
You can always use help in terms of depth. Maybe they go the free agent route, but given Dan Wilkinson's age. The Oregon DT, Ngoti? might not be a bad choice for Detroit.