I think if the perspective owner is an experienced competition home, there's no worries of them going at 8-10 weeks, but I'd have to agree that 12 weeks is MUCH safer on the puppies to give to just anyone.
Either way, congratulations. Do you have photos of Daddy?
And you said that they have "Champion Pedigree's", what lines are these kids out of?
GOOD LUCK, no doubt you won't need it though!