The brett plays well with fruity hops in my opinion. I have used Nelson Sauvin in a saison before with great results. Seems to bring out some of the winey/champagne character a saison can sometimes have. So I vote Nelson with the saison. Wakatu would also work well here as well.
As for the IPA, I would add a blend of the three (wakatu, sauvin, and citra) for the IPA. Probably would go a little lighter on the Citra though so it doesn't overpower the others. Do you have any piney, resiny/dank hops you could add to the dry hop to balance the fruitiness? Colombus, Simcoe, or even Chinook?