Bob and Allen should be candidates.
Up to now? Vasilevskiy without a doubt. Fleury, Quick, and Crawford are all in a position to challenge (should they stay healthy enough to keep playing). Anyone outside of those 4 is probably a long shot at this point in time -- the next guys on the list have a lot of ground to make up.
Voted Crow, and then just looked and saw Vas had posted 2 shutouts in his last two and his numbers are by far the best now, whoops.