I think any champagne yeast will do perfectly fine. They are all used to make champagne, for Chrissakes. Not like there's any crappy ones.
Besides, the champagne yeast is there to finish off the beer, as most beer yeasts aren't really strong enough to do the job. But it isn't there to add significant flavor or aroma. That comes from the primary yeast.
Use what is most convenient for you to find/store/pitch.