I'm all over Ethiopian! Everywhere I've had Ethiopian Fair Trade (TJ's and the coffeeshop where I work included), I've loved it. A clear winner in my book.
If you see it, I like the New Mexico Piñon Coffee for a nice treat. It tastes a bit nutty and chocolatey. Other than that, I've tried their Ethiopian Yirgacheffe and liked that. A bit citrusy.
I love the Sumatra. Fair trade, organic and affordable. Can't beat that!
We've tried them all, and usually stick with the Bay Blend. It's dark and reasonably smooth and it's affordable.
I like Peaberry, but I think it's only available for a limited time.
I just picked up some Bolivian. Pretty tastey. Can't say it is my favorite from TJ's cause it's my first TJ's I have tried.
When I buy coffee, I look for the single source bean type instead of the coffees that blend beans. Information on how to select your coffee is available on the "Bulletproof Coffee" website. http://www.bulletproofexec.com/how-to-make-your-coffee-bulletproof-and-your-morning-too/ I haven't bought his brand but I still do look for single source coffee beans for less bacterial matter on the coffee bean.