I had some pretty sweet Yokohama Advan Flevas on my GD3 Fit! They were nice and sticky, but they were also on 15" wheels on a considerably smaller car. The Pilot Sport 4S tires that come on the Elantra N are pretty serious tires, though they are also kind of pricey. Will be curious to see what others do; my first order of business is to get a dedicated set of snow tires, and I'll probably stick with the all-seasons for a bit until they wear down, but the end goal is to have a dedicated winter wheelset and a summer wheelset.
Kinda toying with the idea of eventually getting a downsized wheel (17") and a beefier sidewall on a summer tire. Might be a silly idea, but it might be more forgiving over New England roads and it could look sweet depending on the wheel. And as long as it doesn't sacrifice too much in the way of handling, even better.