We have the B70, love it, but it took me a few to find coffees that were close to what I used to make in my regular coffee maker (double strength flavored Dunkin Donuts, refrigerated overnight before drinking

). Eventually I gave up on replicating what I was used to and searched for keurig styles I liked, and now have a small arsenal.
Deals vary by machine and what you want in yours. I've seen models as low as 99 without any sales, so decide what model you want first and then start hunting for the deals. For us we wanted the larger reservoir, the variety of cup sizes, and I love the fact that we have it programmed to turn on when we wake up so it's ready to go as soon as I get there.
They have a special insert thing called "my K cup" which you can use any type of coffee in, and it does work very well, so you could use your current favorite in there. I couldn't get mine to be as strong as I liked so I gave up and looked for the regular k cups to use. I think the cocoa k cups are weak and much prefer to just make hot water with the machine (run it with no cup in) and then mix in my own cocoa packets.
Anyhow we do love our keurig, and have turned many people we know onto them. Our schools PTO even bought 3 for my kids preschool to save the teachers the trips they made (a few times a day) to go get coffee off site. The teachers supply their own k cups and can stay in school and enjoy their break time without running all over town for a good cup o' joe.