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"Are you going with a brick facade?

Yes. Entire front is brick facade with exception of a stone gable (which is over OSB ... as opposed to John Kerry who is an SOB ... nyuck, nyuck). Side and rear are brick on 1st story, and vinyl on the second.

This stuff is fine for sheathing behind the facade,there are three grades,the top is rated structural.

As far as the vinyl goes,it is not a nailing surface you'll need solid sheathing for that,O.S.B will work,I don't like it,I would choose 1/2 B.C plywood,but that's just me.

The foam product has both an insulating and vapor barrier advantages,make sure that your insulation contractor knows that,he won't have to install a vapor barrier behind the insulation,and make sure he factors in the R-value differance into those areas,he can use less insulation.

The areas that are sheathed O.S.B will require a vapor barrier(plastic sheething stapled to the studs between the framed wall and the sheetrock).

What are they sheathing your roof with?

And with the O.S.B,make sure all edges are intact,and that it stays dry until it is enclosed.

For floor decking,if you contemplate putting in hardwood at some point,no O.S.B,it won't hold the staples.