Great espresso will make great coffee. Not always great coffee will make wonderful espresso when brewed.
In our lab and office we brew Koffee Kult Dark Roast for our espresso. This was originally called espresso and the name was changed when we started to sell it on the internet. We also grinding Eye Cracker Espresso for internal and retail use.
We recommend these coffees for espresso:
Koffee Kult Dark Roast
Eye Cracker Espresso
Koffee Kult Medium Roast