I thought McCabe was playing really well just before he got hurt. I pencil him in the top 4, with Risto and Scandella. Risto and McCabe would make a very good 2nd pairing IMO. I'm comfortable with Scandella on the first pairing with TBD.
That said, I'd consider moving Risto if the right deal came along. He's not exactly a great fit in this system, he just doesn't have the skating ability and his passing is questionable. Swap Guhle into the 2nd pairing with McCabe, and Scandella with some stud who can QB the PP, and now you're talking. All top 4 guys can skate and move the puck. Let Bogo, Nelson, Beaulieu, etc... fill in the 3rd pairing.