From one of the local places I'm looking at Anzio Vision or Anzio Light 16" wheels, which would be ~$500 including mounting the original tires, balancing, and installing TPMS sensors that I provide (which I'd rather do, since they sell theirs for $60 each). Both of those Anzio wheels are in the 18-19 pound range (18.9 and 18.3 pounds, respectively), so a bit lighter than OEM.
This is the Vision:
And the Light:
I'm partial to the Vision. The ANzio Turn looks nice too:
Tirerack shows all of them as fits for the Leaf, so I would think that means they do in fact fit.
Now I'm wondering what TPMS sensor to get. There are sooo many different ones - are there aftermarket ones that have been confirmed to work well with the Leaf (ideally programmable ones that can be given the same ID as the OEM ones to simplify winter/summer swaps)?