Welcome! There are lots of good Karmas out there - I would suggest you consider the 3 currently being posted on another thread by @FiskerPhilly
. They have been serviced and updated and you can be more confident on the history of these cars IMHO.
Good luck with your search and just take your time. A little extra due diligence and patience can mean the difference between a great car with few issues versus one with lots of potential headaches.
P.S. I also have a Volt as my daily driver, and you will love driving the Karma by comparison.