I'm running the Eibach pro-kit and KYB non-adjustable shocks and struts. I went the KYBs because of their price.
I really like how my car drives now, it's very tight. It used to feel like a dump-truck. When I picked-up my car after getting all of the work done at HPMotorsport, the guy that does all of the test drives mentioned that it was one of the rougher riding combinations that he's driven. He said the Koni stuff has a lot better ride-quality.
Like I said, I really like how my car drives now, but I don't mind the rougher ride. I would guess the KYB adjustable stuff may offer some different characteristics than my non-adjustable. You may want to stay away from the KYBs if you're wanting the luxory-car feel.
Oh yeah, the "guy" who does the test drives at HPM is Paul Brown. He drives a Saleen-bodied Mustang on Speedvision's World Challenge. He knows a few things about ride-quality.