re: Difference in the Keurig models?

I got my last one at Office Depot. It is the one with the 6, 8, and 10 oz selector switch and it also has a function to pump the water out of the interior for cleaning. We make about 4 cups a day at home and always use the 8 oz setting. The unit cost me around $120 plus tax. The first Keurig I bought was a basic two cup size home model and it lasted 4 years. The new one is an office model and the pumps on them are supposed to last longer than the home models. The cost is about $10 more for the office model.
We use filtered water in our Keurig as our tap water can get funky with chlorine, which gives the coffee a very bad taste. Filtered water also probably will extend the life of every coffee maker, not just the Keurig.