What is a better buy among Nissan Altima Coupe, Infiniti G37, and the BMW 3 series coupe?

It really depends on what you're looking for. All seem to be on the sporty side of cars, so you've got that with all three models. The BMW 3 series is probably going to be the most family friendly since it's a four-door car, plus you've got BMW service and name with the car. Just remember that if you plan on owning it past warranty, expensive cars require expensive maintenence. they figure you've got the money to buy the car, you can afford fixing it. since Nissan owns and makes both Nissan and Infiniti, the quality are going to be the same for both, which are good. You'll pay for the G37, but it flies. The kicker are the seats in the back are a joke, so it depends on your needs. The Altima Coupe is real sporty, but I have yet to see the interior. and after all is said and done, it really is personal preference. it makes it hard to decide since we're not given a budget to make a wise choice for you.