The FanSided NBA network has many great writers who put in hard work every day to churn out interesting news and, my favorite part, unique rankings. Recently, they published a ranking of all NBA Champions throughout NBA history. There have been 72 championship teams up to this point with 2011 team being the only representative for the Dallas Mavericks.
These kinds of rankings are always tough, because any team outside of the top five is probably not going to agree with their rankings. The problem is that every champion beat every team in their path for that given year, so it is hard to discount what they did and rank it against other teams that did the same thing.