The more I think about it, the more confident I am that Helenius will be the pick (assuming nothing crazy happens in the first 10 picks).
Helenius is a smart, well-skating center who plays a good all-around game. With the center prospect pool as barren as it is, and especially the departure of McLeod, there's a real gap in that position. Unironically, I think a concern that Fitz and co might have with Helenius is that a potential future center depth of Hughes-Hischier-Helenius is on the smaller side. But that being said, there's still a ton of potential with Helenius given his intelligence and ability read plays as they develop.
Similarly, I'd be thrilled with MBN, especially as he's more chaotic and has the better shot than Helenius. Both very talented players and I'll be happy with either of them, but at least at this point, I think Helenius is the guy.
Catton has to be incredibly high on the Devils list, but I really doubt he's still on the board by #10.
Some potential later-round players that I really like are:
Hiroki Gojsic - Forward, Kelowna Rockets (WHL)
Mac Swanson - Forward, Fargo Force (USHL)
Justin Poirier - RW, Baie-Comeau Drakkar (QMJHL) -- he's already been mentioned above
John Whipple - LD, USNTDP (USHL) -- and not just because he's an NJ guy
Kieron Walton - C/LW, Sudbury Wolves (OHL)
Ilya Nabokov - G, Metallurg Magnitogorsk (KHL)
Wait... you're liking a GOALIE???
Oh wait, it was @StevenToddIves that had goalie angst.