Nexus 7 (2013) by Asus
When Google released the 2013 version of the Nexus 7 it was ahead of it's time. Even as I write this in 2017 the display resolution, RAM (3Gb), and Storage capacity (16G/32G) are hard to find in a tablet under $300. It included QI charging, an excellent display, and had very wide aftermarket support.
This tablet has been a workhorse and was used daily for years. It's still a handy size and I keep it as a backup.