Tapatio
Tequila Ocho
El Tesoro
Siete Legues
Teqillino
Don Fulano
Cascanes
plenty of good ones out there.

All additive free and reasonably priced. Daily for mixing, blancos. Sipping, anejos. I typically stay away from the personality-backed tequilas. Lots of folks like Casamigos as it has a bunch of sugar and vanilla.