Looking to buy new car, can't decide on which is best...?

About to graduate, and getting an "almost new" car. I have a list of cars that I'm trying to decide between...Civic Si (coupe or sedan), Acura RSX Type S, Nissan 350Z, Audi TT, Scion TC, and Chevy Cobalt. The 1st three are my top choices. My parents are afraid to help me buy an Acura because they fear high maintenance charges that Acura will charge, like BMW and Mercedes, but I am not sure if this is the same with Acura. I need some real help, with hard facts, and not just opinions. I'm taking into consideration: gas mileage, insurance cost, reliability, performance, and appearance. I've been to all of the review websites, but I seem to need more help.