We were leaning toward that but we already had the 19's so an easy tire swap. My wife got the wheels as a present for me. I think even over the 19" Geminis, we saved about 9 pounds per wheel. So basically from about 30 to 21. Not sure how much exactly as our scale isn't the most accurate at low weights but even the tire installer how came out to mount them commented on how much lighter they weighed than the stock.And Martian makes 18" wheels for even more comfort.
While I wouldn't have minded going with the 18's to save even more weight, they might have looked too small on the MY. In the end, we are both very happy with how it turned out. Wasn't really sure if we would like the looks on the car but surprisingly even my wife really likes the improved appearance.
I would definitely encourage anyone to try the lighter wheels before the suspension mods, especially if you are considering both.