hmmm.... if you can afford, it definitely go with the twincharge, you get both turbo and supercharger.. which would definitely be a party in your pants.
as far as the seats are concerned.. i don't know what color your inerior is, but M seats are more than sufficient. unless you're going to actually race it and actually NEED them, they're a bit on the ricey side. its also an issue wiht the ladies, they wanna be comfortable, not restraieined in what they feel is a baby seat.