persian himalayan mix kitten - flat face?

I am deciding whether or not to purchase a persian himalayan mix kitten. The kitty does not look like it has the flat face but I was wondering if that can change? I really prefer the doll face. The kitty is pure white like the mother and grandmother.
Also when a cat such as a persian has not been bred with a regular cat does that cause more health problems?  And final question, the kitty is 5 weeks old has not had shots or dewormed, vet check and the price is $550. Any help would be appreciated! 

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