If you're including a Maxima, then I'm going with a TSX or an IS250, better cars than the beefed up Altima known as a Maxima. I remember an article a few years back that broke down how it is pointless to buy a Maxima when you can get a comparably equipped Altima for thousands less.
What I'm really getting at in this post is that you posted another opinion thread with a bias towards your chosen brand, Nissan. I notice how you put the Camry against the Maxima instead of the Altima (which it is getting more difficult to distinguish between categories as the models fatten up over the years, big cars falling off as new compacts are added, putting the Civic and Sentra in the midsize category, but anyway). The car to compare to the Maxima is the Avalon and the TSX or TL, which the Maxima will most likely lose against wholeheartedly, not to mention the 3-series, A4, C class, and even Nissan's own G-series. I'm sorry, Nissan loses in every way, the Maxima is a Pterodactyl, majestic in it's day, but useless in a current world.
Now, if you would have put the Altima up against this crew, I might have voted in that direction, my friend has a six speed V6, it's pretty nice without having a $30k plus base price.