I have a Samsung Evo 64GB. Works pretty great for me. Although I am trying to get most of my stuff switched over to .CIA installs.
Just make sure you get a real card. The first Sandisk 64GB card I got was fake.
I agree with Joe, cia files are more an advance level. Though you can backup your emnand and is highly recommended to do it often.I dont really suggest installing them as cia's, if something goes wrong with your emunand...
64GB cards are fairly cheap so it isnt that big of a problem, just make to to buy a sandisk or samsung branded one (for reliability)
64gb cards are on sale for around $35 on amazon. That's what I got.
You will only need the blue card if you are downgrading to 4.x.Haha, not in Kangaroo fun-bucks they aren't.
Alright, the gateway came in the mail today so I'm buying a 64GB. They're on sale at my local big box store right now. I'll grab the smallest one I can find for the blue card, too.