Hmmm this is tough.
Hornqvist is the safe pick to put up 50 points.
Konecny goes from getting great PP usage & 17+ minutes a night - to >15 minutes & non existent on the PP for stretches, but has 11 points in his last 9 games.
Palat has the highest upside, and is on a high scoring team but can't stay healthy...
Seeing your roster would help a little, but with not knowing it I'll go with Hornqvist out of the 3 as the safe pick. If you have a bunch of consistent vets I'd lean more towards Konecny who could net you 60+ if he can get consistent minutes at both ES + PP.