Blues are a very scary team and will be very difficult. O'Reily must have had a "talk" with everyone right before they turned it around.
I know everyone here hates Vegas (I don't), but that is a ferocious team top to bottom. To me they are the #1 team in the league. Two elite goaltenders that are both very healthy and fresh, Stone having a Selke caliber season, Theodore having a Norris caliber season, Pacioretty is a threat every single game, etc. Anything short of a Stanley Cup is a failure.
Not sold on the Avs. Their goaltending sucks and they are too inexperienced. I'd expect St. Louis or Vegas to beat them.