Raitt or O'Toole are the best moderate candidates and have a good chance in the GTA swing ridings.  O'Toole has more potential in Quebec, while Raitt has more potential to break the red wave in the Maritimes.  Both offer enough to the prairies (modestly lower taxes) without trying to appease social conservative issues.  Given the ranked ballots, the could well be a number of O'Toole-Raitt-Chong or O'Toole-Raitt-Scheer clusters to beat out Bernier, but who prevails between the four of them is still a toss-up.