What case should i get for my iphone 4s?

So i want either the otterbox armor or defender but i'm not sure what to get i know they both make it bulkyer and i'm ok with the defender bulk but is the armor alot bulkyer and is waterproof really worth 100 dollars i really like that case thouggh and this iphone is going to have to last for a long time. Also if you have any other case suggestions that are waterproof other ttghat lifeproof and the griffan case i would like to hear about them.

Defender