Yes, I'm just looking at numbers, but I'd put Blake Montgomery at 2.
Kleven isn't a prospect anymore, Halladay has good hands and vision, but lacks speed, strength, and defensive awareness required to be an NHL player (Jaraventie part 2?), and Ostapchuk has 4th line upside.
Montgomery is the same age as super-prospect Easton Cowan, and has the same PPG on the same team.
When your prospect pool is very weak after #1, Monty seems like a good #2 to me.
(Merilainen would be #2, but I'm not considering him a prospect anymore, I think he's done with the AHL).