A great pass rush makes average db's good and good db's excellent (just look at Tampa).
With that said, Terrell Suggs is my choice at #4 if he's available.
Suggs at Right End
Brown at Left End
Daniles/Robinson/Washington/ up the middle
You've got yourself a pretty athletic, quick and yet still big in the middle d-line that helps the db's.
Throw in a healthy Holdman with Urlacher and Bobbie Howard you've got pretty good lb's.
Get Brown, Azumah, Green, and last years Rookie in the backfield and while average, can look good if the front 4 are as good as advertised.
Round 2 would bring me to select a corner if one was there, or possibly a QB but I think Boller/Lefty/Palmer and maybe Grossman are all gone by then...after that they are all crapola (PLEASE DONT DRAFT RAGGONE!)