Those teams, NE and Philly, both were consistant playoff teams when they started trading down.
How good would the Eagles be if they traded out of the 2nd overall pick in '99?
If the Bills can pick up an impact player at #11, they should make the pick.
If the Bills are looking at a 'solid starter' type player, they should trade down.
There may be a Dwight Freeney or Patrick Willis available at #11 this year. If so, the Bills should draft him.
Of the 7 players drafted at #11 from 2001 - 2007, 7 have made the pro-bowl at least once.