Mini Hempy Buckets, I might end up transplanting from the 3 liter to a 3 or 5 gallon before I flower.
That's the dripper setup I put together. All materials, including tools to make it, were under $100, and I put it together in under an hour. Might look complicated, but it is extremely low maintenance, I could not look at the plants for over a week and they would look better than before.
Both of these can be scaled up very easily. I recirculated the drippers, they dripped twice a day, and a 5 gallon reservoir lasted a week no problem, never had any nute or ph problems, switched the reservoir once every 7-10 days.