While ifconfig is right to recommend the Flysky FS-i6 because it has everything most pilots ever need, I should add that the next step up is only just above your $80 price point.
The Taranis QX7 and Jumper T8SG are the bottom end of transmitters that run the open source firmware Open Tx. Because the software is free, you get all the (software) features of a high end radio. You'd have to read the manual to see them all, but principally you get the ability to chose what each switch does, and it supports telemetry, and virtually unlimited model memories.
The shear number of features and the size of the manual can put some people off, but others like knowing that they have every feature they could imagine.
Additionally the Jumper is multi-protocol and can use a wide range of receivers from other brands, and can control many 'toy-grade' RC drones and other things. The Taranis case feels higher quality though.
You may well ask why there are more expensive transmitters; mainly they have bigger, better quality screens and better quality sticks, switches and plastic cases. Also, after-sales support and repair, which you don't really get with Chinese radios.