I second that. Dark roast Sumatra. Costco sells a good version of it for a relatively low price (considering the quality of the brew). Mixing it with Arabian beans is pure perfection, although Arabian beans are rather expensive.
I love the flexibility and ease of the Keurig K-Cups. Mostly a Starbucks person myself, so I like their French Roasy and Cafe Verona. Sumatra is pretty good, but clogs up the Keurig machine.
San Franciso brand (I get mine on Amazon) is very good.
Good thread everyone. lets keep it going. (nice break from the politics)