After the lease ended I leased a 2014 BMW i3 ReX, an EV with an onboard generator fueled by a 2 gallon gas tank. The BMW was a more enjoyable car to drive (sorry, not meaning to be offensive), but it suffered from several electrical and other issues, especially poor range in cold weather.
I'm not surprised about your i3 issues. The i3 REx is a POS from a reliability POV. I cannot recommend anyone lease or buy one. And, I'd tell anyone to dump it once the warranty expires, unless they're willing to pay for an extended warranty. When that ends, dump it. Keeping it means the possibility of it being a money pit.
I'd wager you suffered from at least a check engine light, drivetrain malfunction and possibly even a breakdown that required a tow/flatbed truck. And, if you were unlucky, a restraint system malfunction and a faulty charging handle lock mechanism.
Has the battery held up for most owners (I've read that the 2014 and subsequent batteries were upgraded versus the 2013)? I also prefer the faster 6.6KW charger, but it isn't a real problem to charge it overnight since I won't have to charge it during the day most of the time.
Yep, as others mentioned, '13 Leafs built on/after 4/2013 seem to have better batteries from a degradation POV.
6.6 kW OBC is nice. Lets me pick up more juice quickly from free public L2 charging as well as charge more quickly at work, tie up a handle for less time and plug in much later (when there are definitely open plugs).
I've found a one owner car model S with 15K miles from a non-Nissan dealer for $8,500 or so, and the Nissan dealer is a bit higher - closer to $10,500.
As you've noticed, Nissan franchise dealers have a big markup. Have you checked Craigslist? Know of any non-Nissan franchise dealers in your area that pick them up from Manheim auctions (http://press.manheim.com/2010-07-27-Man ... into-sales
Definitely use Leaf Spy on it and run a Carfax and/or Autocheck to see where it resided before. Assuming you don't want to go w/the battery "lottery" result, you want one that resided in a cooler climate.