This is what I use: https://www.amazon.com/gp/product/B01HIT0XCA/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

I also like Stok.

I've tried using more expensive beans with similar results.. The taste was horrible.

I've gone back to a cheap breakfast blend. I use a mason jar and my brew soaks for at least 48 hours.