CSS/T struts/shocks all around will cost LESS than ONE PAIR - as in, just the front or rear - of the Koni's, AND they bolt straight in vs. the project that is installing the Koni's up front. Not adjustable out back, but stiffer than the stockers. I've driven and even autocrossed Ionick05's ride, CSS/T all around with Progress springs and Progress bar. Works VERY well.
In short, Save 50% and get the Cobalt Turbo bits. If you were ready to dump the cash anyway, save 25% or so and get the Koni's in back, with the CSS/T struts in front. Because it's such a PITA to instsall the Koni's in front, and we can't really adjust them anyway without taking the struts down, and you're not going to turn the fronts up more than 50% anyway - they make no sense, lol. And that's coming from a guy who has the Yellows all around.