These are the three that I have used.
http://www.keurig.com/brewers/b3000se
- This one is best if you are planning on hooking up to a water supply, that is how it works. We had this in my last office building and it was AWESOME.
http://www.keurig.com/brewers/platinum-brewing-system
- My parents have this one, It has a reservoir you have to fill up, and allows you to select the amount of water you want to use.
http://www.keurig.com/brewers/deskpr...brewing_system
- This is the one that is currently in my housing unit. It is the most simple, you fill your desired cup with with fresh water, pour it in the reservoir, and it makes that exact about of coffee. It is great for regular mugs and travel mugs.
I hope this helps you select the one that best works for you and your wife.