Cobb springs lower the car too much for the stock geometry and for the stock struts with their little bump travel. You'll be sacrificing bump travel and your ride quality won't be very good because you'll be riding on the bump stops more than before with the stock springs. This means that you will feel more of the small imperfections in the road, as well as feel every mid to major bump. Lowering springs don't work well with the stock struts.
The swaybars in the kit are pretty decent, and I think the fitment issues on the rear bar have been fixed. They're mid-level at 25mm hollow, they aren't as aggressive as the Whiteline 27-29mm solid, but they're not as wimpy as the Cusco 22mm. They seem to be a decent compromise between a street-only bar like the Cusco, and a bar made more for track and autocross use in the Whiteline. I say this with firsthand experience of running the Cusco vs. the Whiteline. Below ~40mph, the Cusco bar was noticeable and did a good job, but in hard transitions and at higher speeds (like slaloming) the WL bar made itself very apparent beyond what the Cusco could do in roll stiffness.
If I had stock struts again and I only wanted a decent street car, I would do the following:
WL 24mm front and rear 22-24mm bar OR Cobb's set
Kartboy Endlinks
Prodrive springs with shortened front bumpstops OR RCE Lowering camber plates on the stock springs
Group N strut tops
Car Labs X Brace
Also, good tires and an alignment are a must.
This setup will outperform the stock hardware, give you a little bit lower of a ride height without sacrificing too much bump travel (or any with the RCE plates), and will do a pretty good job in the twisties.
Bonus: The X-Brace will cut down on a lot of the noises from the rear of the car.