My Tripp Lite works pretty well, it's an RV 1500 watt MSW I think. Just keep in mind that AC coffee pots suck a LOT of juice. I usually idle my van at least when making coffee, and more often than that since my batteries are low after running fridge/furnace/etc all night, I'll just fire up my little Honda generator. I was just looking at 12V coffee pots and they seem to all have horrible reviews.
I keep an old GSI coffee press in the van if I'm boondocking for a few days and just boil water for it with propane.
FWIW, I had a very LOUD Cobra interter before this and it did great. For $100 I was pretty happy with it, but the fan and beeps were super loud.