Take Jake Long even if we can't trade the pick. Off the top of my head, the stud to bust ratio for OTs taken with one of the top 10 picks is much better than any other position, especially quarterback.
Tony Boselli, Jonathan Ogden, Orlando Pace and Joe Thomas all made an immediate impact. Robert Gallery is the only recent major bust that comes to mind. Tony Mandarin a blast from the past.
A good o-line makes decent quarterbacks good and can turn above-average quarterbacks into Pro Bowlers.