What should I do? Stick with my civic or get an infiniti?

I drive a honda civic 2008 coupe automatic lx.(62k miles) I still have about 7000$ to pay off.. kbb.com says I can get around 9k to 10k depending on who i sold it to. I really want an infiniti g35 coupe with about 95k miles for about 14k.. Should i even try to get an infiniti or should i stick with my civic.. If you think i should get the infiniti please tell me what the best route is.. should i sell my civic? keep it and pay it off and then sell it? or should i try to trade it for the infiniti and pay the difference? Please help and any input will greatly be appreciated