Out of these options I'd say Connolly. I think a lot of people are going to be surprised how good he is once he's given a role he can thrive in. He was forced onto the 4th line in Tampa and didn't get much of an opportunity. In all likelihood he'll be given a shot in the top-6 and he'll probably be Krejci's shooter... Heck, even Seth Griffith can almost score 10 with just that.
I bet he could score 25 this year while being a good power forward. He's healthy for the summer and is on a "prove it" contract. I think he will.