The Padres seem to be re-emerging as a team for the Phillies to worry about. I would think right now it's Phillies, them and Arizona as the favorites to finish 4-6, but that could be in any order.
A loooong way from thinking about it for real, but it will be also interesting to ponder whether you'd rather try to beat Atlanta for the third year in a row or finally face the Dodgers in a possible NLDS. Probably the former, familiarity (and time zone/less travel) still counts for a lot.