Like "BG Wells" says, the 1078rr is the Daddy.. and you will enjoy every single moment with her
As for the price, I don't know how much they are in the US, but I can tell you just for reference, in europe they are somewhere between 8.000EUR with approx 20.000km and 12.500EUR with approx 2.500km
In any way, good luck with your choice and enjoy the F4 !!!