Detellier On Draft/Saints
I prefer trading down, because I like multiple draft picks... trading up comes with more risks of second guessing and was this player "worth" the picks you "could've" had.
Jamal Brown paid off but that was a couple of spots, but the Johnathan Sullivan experience has soured me on trading up too far.
I'd rather sit back and see what starts falling, and trade down if you think you can still get that same player or one comparable.