Well, nearly half the team is going to be either a restricted or unrestricted free agent (if next year is an uncapped year, my understanding is that all free agents will be unrestricted), and I'm not sure how many guys they could keep even if we wanted to, but. . .they need to make some major improvements on defense if the Saints want to have another serious shot, IMO. And we need help everywhere--linemen, linebackers, safeties, and corners.
The offense needs to keep that O-line together as best it can, and the most important piece of the equation--Brees--is gonna be here. It would be nice to keep Pierre Thomas, but I think the O-line is the real key. If they can open up holes for the running back to get 5-7 yard rushes consistently, even he wouldn't be essential.
Reggie Bush has to go. Too much money for too few dividends. We could pay for 3 or 4 half-way decent defenders with his salary. Frankly, I think you could take any 3 starting wide receivers in the league up there with Brees, and he can make them look amazing. So, I'm not sure how much that matters, but if we could keep Colston and Henderson, I think we'll be in good shape