I can't help feeling the Yaris GR is so capable (far more than I am as driver!) that I'd never experience anything near the full spectrum of its handing on the public road, not without risking my licence. I won't ever do a track day, so with my sensible head on, the i20N is probably all the performance I'd ever need. Hopefully it won't be so very capable that it can't still be a bit unruly when conditions aren't great, which is a bit childish I know but at least it's fun!
As for colours, there's a lot of surfaces and maybe a bit too many different finishes (black, red, chrome etc). I'm not a fan of black cars but I might consider it to tone down the look. But as ever, I guess you need to see it in the metal.