Long. Although his played declined this season due to injuries, a great left tackle is hard to find. He is still worth resigning, as our O line is not that deep. RB is OK if Bush leaves, and although I want Hartline to stay, and expect that he will, I think we will draft a couple of WR early anyways. His possible loss could be covered. Smith is another one thatn if he goes, could be hard to replace. Not great, but solid, and we need DB help, but Long would be the biggest loss IMHO.