I think you should get a Mazda RX-8.
But it really depends on if you're looking for classy or sporty.
The altima is kind of sporty, but is more professional.
The RX-8 is all sporty.
I think the altima has more horsepower though.
I hope I helped
I personally like the RX8 more in terms of styling, however, the RX8 is plagued with problems so I would opt for the Altima V6 if I were in your shoes.