Hmm personally I'd say it would work better with Rarity as Nene since they track fairly well if you substitute Rarity's obsession with fashion with an obsession with computers.
Definitely Dash as Priss, and Applejack as Linna. Truthfully no one fits spectacularly as Sylia but Twilight would actually make an adequate fit, and the brother/sister connection with Spike would track across to damn well not to do it.
Pinkie Pie is a toughie, I'd be inclined to have her as either Vision (Technically both left a family business they didn't like in order to make other people happy...) Or appearing as a Host of the Minor characters in silly disguises.
Definitely Dash as Priss, and Applejack as Linna. Truthfully no one fits spectacularly as Sylia but Twilight would actually make an adequate fit, and the brother/sister connection with Spike would track across to damn well not to do it.
Pinkie Pie is a toughie, I'd be inclined to have her as either Vision (Technically both left a family business they didn't like in order to make other people happy...) Or appearing as a Host of the Minor characters in silly disguises.