My advice would be to go with the pastel male and normal female. That way if you decide to pick up another normal you can get a female and still make more pastels. If you get the pastel female, you'll be kind of stuck...unless you get a spider male or such to breed her to!
JonV
Exactly what i was going to say
Its also cheaper to buy an older normal female and faster than buying a female pastel and waiting 2+ years