Accessory Which SD card to purchase?

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http://androidforums.com – Guys, Will probably buy MMX a87 Ninja 4 in a few days. This would be my first Android. And I am really confused after searching a lot on SD card's class. I am looking for a 8GB SD card. According to some reviews, I heard the bigger the class, its much better. Is it so? I'm actually a noob here. Take your time & do reply. :) Phone Specifications: 256MB RAM 4.0" Touch About 185MB Internal Storage 2MP FF Android 2.3.5 (General)