Samsung galaxy tab 10.1 vs 8.9 vs 7.0?

Basically, I'm in the market to get on of these for Internet to go...not for business or documents just Netflix, email, Facebook etc. when I travel. Other than the sizes of the tablets, what are the main differences between them... I am most likely to get a 8.9 but how much different is it from the 10.1 or 7.0????? Please help I want to know the specs before I buy this $500 piece of equipment...I'm also not going to be saving anything like music or such on here so I don't care about the memory sizes. Also do they make those cases thr cover the screen and are flimsy an can fold like what's popular on iPads?...and last please don't send me any links on comparisons they don't really help
 
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