What kind of Android tablet should I get within my budget?

Hopefully this kind of post is alright here. I'm going to be buying a new tablet next week and I'm having trouble figuring out which one to get. I do have some things that I'm specifically looking for and some devices I'm currently debating between and would just like some input. The last two tablets I had were the original Google Nexus 7 and the 2013 Google Nexus 7.

Requirements

• Under $300
• Must be purchased from Office Max (I have a gift card)
• Quality Display
• Runs smooth (at the very least not an incredibly laggy UI
• 8-10" screen

Currently Considering

• Samsung Galaxy Tab 4 8" or 10.1
• Samsung Galaxy Tab A 8" or 9.4"
• Samsung Galaxy Tab S 8.4 (IF I can catch it on sale under $300)

What I use a tablet for

• School! I only buy ebooks and need the text to look good and be readable
• Browsing the web
• Steaming videos
• Streaming music
• Occasional gaming (Usually not 3D games or anything to demanding)

Thanks in advance for any advice. I know I only have Samsung listed, but that's because they're a big name and I've owned Samsung products before. I'm open to anything though!