I'd think it'd be between Lee, Nelson and Strome. Bailey doesn't deserve a shot at top-line. And I agree, no need for Vanek.. instead please, please, please plug the defense and goal tending holes.
I think if Strome were to be moved to wing, it would probably be RW. I doubt he'll be considered for that spot, but who knows. Not so sure about ruling Bailey out either. He's had a lot of success with Okposo in the past, and even Tavares in limited time. Plus they might want to go with that 'kiddie' line of Lee-Strome-Nelson, in which case the only options for that top LW spot would be Bailey, Grabner and our draft pick(if they deem him a possibility to make the jump right away... considering it will be a top-3 pick, I wouldn't rule it out).
I'd probably be in favor of these lines, or something similar next year:
Nelson - Tavares - Okposo
Lee - Strome - Callahan(yes, I'd give him that $6.25M+ deal)
Bailey - Nielsen - Grabner
Martin - Cizikas - Clutterbuck
x - McDonald; Boulton
I think we could do a lot worse than that up front. It will all come down to who our new HC is, and who we decide to bring in between the pipes. Not sure if much has to be done defensively other than bringing in a veteran depth guy. Maybe some kind of #5-7. I like how the young guys have stepped up lately, mainly de Haan and Hamonic, and I am sold on Reinhart making the jump next year as well. IMO our defense will quickly become a strength of this team, regardless of which signings or trades we make.