I've said it before our best addition was by subtraction...getting ride of 4/5 of the oline and cats like Mr. Softee (Griese) and Marion was slowing down despite the pro bowls.
But I agree with most cats that Boston is the best addition, although many are good. Boston has the greatest potential to help this team score points and maintain drives and converting 3rd downs. He opens the field up for Ricky, Chambers and McMichaels. Puts less pressure on either QB because he's the type of guy that can take a 10yd curl, quick slant, or WR screen to the house! Physical and intimidating on short stuff.
All in all, Spielman has done a good job at filling need positions and depth. They aren't all namebrand guys that we desire, but they are all upgrade to what we had prior.