Best possible (realistic) trade I can come up with right now:
Benn (500k retained), Roussel and Brisebois for Colin Miller. Saves Buffalo cash and balances out their LD and LW depth chart. Saves us a bit of cap this year and costs a bit the next, costs extra cash (which is why I could see ownership declining it). We could then look for some waiver fodder (Kylington, Juulsen, McKeown), and/or cheap UFAs (Koekkoek, Hutton) to fill out the rest.
I don't see Buffalo going for this. Offensive depth is still lacking a little bit, but Benn is junk for them (they have two potential top four D in the minors, and Davidson if things get really hairy with them), Roussel is a bottom six forward with little hope to move up in the line up short of a catastrophe's worth of forward injuries, and Brisebois can't even stay in the NHL as a 7th D. Miller's is still an asset, especially with a reasonable cap hit and no internal pressure to move him, and likely a top four D. Nothing we're sending them has any value what so ever.
I don't think he's a bad target, I just think it will take more than 2 cap dumps and a tweener with ho hum numbers in the AHL and 8 games in the NHL (he's 23, so he's got to improve, he's just not got pedigree, being freshly drafted, or a promising upswing in metrics to claim he has value).
I'd consider Sutter+futures+possible retention for Miller, but what do we add? I'd argue Sutter would contribute more to Buffalo then Roussel, and his expiring contract is probably a plus. Miller still has value at his cap hit, Sutter retained to match his salary is at best neutral value, and we still have to solve for X.