I would say the best bright purple is the violet pigment. Parfait amour looks bright in the pan, but isn't that bright on.
You could also try putting a white/light eyeshadow on, and layering a purple you already have over the top.
STOMP!!! I recently got this color, I loved it and the color payoff is incredible, very bright and it goes on easy. I *think* it's only sold at freestanding or pro stores, and I think it's getting d/c but I think it's a good choice.