Thanks everyone. Pricing for me is a lot different as I don't live in the United States, I live in the Middle East. 68OldGoat, I'm looking for a powerful car, but is comfortable and quiet to cruise around in as a daily driver. It also, obviously, has to have five seats. Preferably American or Australian, as the G8 and GTO are.
SpicyRed06, currently we have a Chevrolet Caprice and it has tons of back space in terms of leg room and height. We hardly ever have adults sitting in the back, that's the main reason why we need five seats, because of kids. I thought the GTO is roughly the same, with a little bit less in both aspects, but not too bad. Over here it's called a Chevrolet Lumina Coupe or something like that, and the standard model of Chevrolet Lumina has good space in it.
jpalamar, like I said because of my location prices are a lot different. I can pick up a GTO with 90k miles for less than 8k. G8's however are more expensive to buy. I never thought of the legal issues though, good point. Another thing I have to think about now. Lol
I'll take a look at CTS-V prices and see what they are for my country. Thanks for your help everyone!