Definitely for a 3rd. Of course our 3rd is the very top of the round, which makes it harder. But Harvin would be worth it. Just a break-out player with excellent moves and amazing quickness. And he did all that he did at the beginning of the year with Christian Ponder throwing him the ball.
We know we want more speed/quickness at the WR position, and he is better than any other WR you will be able to get in the 3rd.
I don't see the Vikings let him go that cheaply though.