I got the SanDisk 128GB microSDXC. It offers a ton of storage with quick transfer speeds. It has been reliable and comes with an adapter in case you want to transfer files to and from a PC. I haven't tried a Samsung one, but I can tell you that Sandisk has been good in my experiences. Got mine for sale on Amazon for $100. Normally I think it's around $130 but I'm sure you can find a deal somewhere.
Also, I have a screen protector from BoxWave. It is pretty good and very affordable. I personally would not risk it, especially if you're ike me and plan to use this tablet/stylus for drawing. Scratches and scuffs will cause distractions while creating an image and maybe even interfere with your drawing depending how deep the scratch may be. Be aware that you probably will want to switch out the rubber nib on the stylus for the plastic one since pretty much all screen protectors create more friction unless you get a really expensive glass screen protector, or a high quality hard plastic one.