Battery OEM Nissan or OPTIMA

Get an Optima battery and the battery minder - it's just a trickle charger that slow charges the battery to a certain voltage and then turns itself off. That's what I use in my S2000.

Agreed with others, weigh your usage and environment/climate into the equation. We will personally be replacing ours with a deep discharge battery like the Optima Yellow, since I've noticed that of recent we've been running a lot quick errands that involve one person running in while everyone else hangs out in the car with A/C on.

I bought a red top used off craigslist over 3years ago and it's still great.

A few months ago I replaced the autozone battery with an optima red top. I've left the lights on twice for over half the day and the car still started right up. I'm really impressed with how strong the red top cranks.

I use Red top Optima batteries in all my cars, I truly hate flooded lead acid batteries as they will leak at sometime in their life.

I run a Optima yellow top as well, but mine fits in just like stock.

The only advantage to Optima batteries is if they are used in an environment where they experience very high vibration or need to be mounted in unusual positions. The longevity of them is no better than a good quality lead acid battery, so unless you're hardcore offroading or need to mount the battery upside down for whatever reason, they really offer no benefit.

Once Johnson Controls bought them, they've become worse and worse.

My optima failed after 1.5 years

Johnson Controls ruined Optima.