I reckon the players Souths could most use are the players they have little or no chance of getting.
Slater will play for Storm, a Queensland team, or head overseas. Small chance of him jumping to Union as well.
I reckon Inglis is a bit of a mercenary and will go wherever the biggest coin is ... Souths could potentially pay it, but they shouldn't and hopefully wouldn't. Most likely to go overseas.
As alluded to somewhere else, Cronk will stick close to Bellamy in my opinion. He's got loyalty stamped all over him. Plus he'd be the cheapest of the four stars to keep and therefore potentially the smartest one to keep given the importance of his position and the fact that Finch is unlikely to be retained.
As for guys who aren't really needed, Smith will play for the Storm or go overseas. I jsut can't see him going somewhere else. If he did, you can beat your house that it'd likely be a Queensland team. I just don't see it though.
Tolman is probably the most gettable. Excellent young talent. I think he'll attract better offers from teams that are more desperate for frontrowers than the Bunnies, though.
Blair and Hoffman will be too expensive for what they could bring to the Bunnies, I reckon.
Purely speculation/opinion on my part.