blstoker
Bill Bergen for HoF!
It would come down to the age old "supply/demand" matrix. If there are multiple teams wanting to trade into the 5 spot, then the price gets driven up quickly. If there is only one team wanting the spot, then it would theoretically come relatively cheap. To move up two spots from the 7 to the 5 would still more than likely cost more than a 3rd rounder though. If you are freaked out that your guy isn't going to last an additional two picks, and you are willing to trade up, then you are going to make that trade sweet enough to make sure it goes through.
It could possibly cost more than a 3rd, but even then, it would be extremely hard to believe the price would drive up so high as to call for an additional first rounder to move up from 7. Maybe from the 15 or later range.
Honestly, I can only see it even getting that hot if Houston or Indy trade down with Detroit and the QB LV wants is still there and they feel they need to hop over the other QB needy team. I just don't see it happening, but stranger things have transpired during the draft.