Any left handed 700 action can be a good start for a project. The M-24 is very very very expensive and almost impossible to get in Canada. One of my friend is a rep. for Remington LE and he told me that. From what he says, it would cost more, admitting than you can get one, than having a custom 700 built from any gunsmith. Also, it would be built for you with all the goodies you want.
A M24 is nothing more than a trued Rem 700 action (they want you to believe it is different but it's bull...., an HS-Precision stock and a very good barrel... He even told me that a 40-XB action is not better than any 700...
The only benefit you would get by buying a 40-XB is choosing the single shot model. It can't be bought other than in the Custom Shop...