Love our Keurig as well. Granted I don't think it's quite as good as a freshly ground bean brewed in a good machine, but it's still darn good and you can't beat the convenience. For instance, I like dark roasts and DH likes medium roasts....this way we can each have what we want and it only takes a few seconds.
We bought our Keurig from Costco, where they had the B50 for $129 with a k-cup adapter, 4 boxes of k-cups, and another box of a variety pack of k-cups. The one thing I wish this version had was the smaller 5 oz brew. I know the later versions offer 3 sizes and I think the B70 has a better extraction method.
I also found the website and forum singleservecoffee.com . That's how I've found really great coupons, reviews on kcups, etc. I also learned from here that sometimes a k-cup can be improved by stopping the brew just as it starts to pour out, letting it sit 20-30 seconds, then starting it again...it improves the extraction. But anyway, that website will also give you good information on other types of single serve coffee brands like the tassimo, senseo, etc.
There are also some websites that will sell you individual pod or cup flavors/types so that you can test them out before buying an entire box. They're more expensive one at a time, but cheaper than spending money on a large box and it going to waste.
Good luck!
P.S. Fair warning, it's addictive! I drink a LOT more coffee now than I used to
