I've never been a big coffee drinker, but I ended up with a keurig with accompanying sample pack for Christmas. Its so easy and convenient I've found myself using it more and more. When I do drink coffee I've always preferred it fairly strong with some sugar. I've found I prefer a strong dark roast, but occasionally I will want a good decaf. However, after drinking a strong coffee, I find even the best decafs not only taste weak, but almost a bit sour. I bought a refillable k cup for the keurig, so I'm not limited to just the prefilled k cups. I also have a coffee grinder lying around somewhere. My question, what are your recommendations for the following: regular coffee, decaf, and expresso? Any other tips or recommendations?