Extended battery question

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http://forums.androidcentral.com – I just bought a galaxy nexus online. I'm probably going to buy the extended battery here Amazon.com: Samsung Galaxy Nexus (i515) Extended Battery with Battery Cover: Cell Phones & Accessories I'm reading some things that confuse me. I have read that most cases will still fit because it adds little depth. Does that mean I don't need the new back cover or that despite the added thickness of the cover, the phone still fits most cases? Also, what is a good slim fit case? I have read posts on this forum and the rearth case would be perfect but its no longer available. I like the incipio feathe (HowTos)