that's a lot of money to be spending on v12s... you may as well get ultrac sessantas at that price point. way better tires.
your pss price seems high as well. are you sure your tire shop isn't pulling a fast one on you?
edit: and i would never consider v12s on these cars stock, let alone modded. they're one of the worst tire experiences i've ever had. my all season conti DWS were way better as a budget tire.