I thought I'd get my mother a Keurig for Christmas...what did I know, turns out there are many models. She has mentioned she wants one, but I don't know which.

She is alone so it won't get heavy use. I noticed some of them make 12oz cups...don't think she needs such a big serving. I don't drink coffee so I know nothing. She will probably drink tea as much as coffee.

Advice on features? Models? Thanks!