I got one of the Keurig Mini ones (K-10 I think it is) for my bedroom, in purple. Yea, I love that it is purple. They have a variety of colors online. I got it from Kohls. I used a 30% off + free shipping code. They were normally like $99. So it knocked down into the $70's. Which I guess that is a lot for a coffee maker, but hey sometimes you gotta do what you gotta do. It is like my favorite thing, that way I don't have to leave my room in the morning. I set it up the night before, then start it when I go brush my teeth. By the time I am done, there is a nice cup of coffee sitting there waiting for me.
We also have one of those regular Keurig brewers in the kitchen. I am not sure what model it is... it is that one that everybody else seems to have. It is probably 3 years old, never had any problems with it. It pretty much only gets used when we have company or on the weekends.
In regards to the mini, the only holding 1 cup worth of water isn't a problem. I found that you can buy little 10 oz bottles of water at like
Walmart and Dollar General. They are absolutely perfect for the mini Keurig brewer. Coffee making could not be easier, 1 bottle of water and 1 K-Cup.
I only use bottled water, never had any problems.
In regards to the reusable cups. I found one at Walmart for under $5. It worked in my mini. The coffee tasted terrible, (probably because it had already been opened like a year or so ago) it was also a pain to clean up afterwards dumping the grounds and all. But anyway, it did actually work. You just drop it in like a K-Cup brew it, take it out and dump it.