Wife loves coffee, me not so much, so I got her a Nesspresso system. It's about 65 cents a cup, a little more for the latte due to the milk, but she loves it and it's compact. There are also reusable capsules for it, so you can put whatever you want it in (tea, coco, Starbucks best dark roast, etc). Now the real issue is how much power it uses, so I'll have to do a test.
In the past, we've done power management due to our old 5ver having only 30 amps, so we turn of the hot water heater and the electric heater when she drys her hair or makes coffee. That's worked for us well, but I admit it takes watching your usage. This manual power management may help you no matter what coffee maker you get.