Astralis is going to win it imo, NaVi could make it to the finals if Vitality underperforms but I doubt they will as they've looked very consistent throughout the tournament and probably want another rematch with Astralis after getting stomped on Inferno yesterday.
In the consolidation final I am giving advantage to Vitality for the same reasons, Zywoo gets more help from his team than Simple and that should probably be enough to see them book another match against Astralis.