There's no way I'll be going to another Dunlop tire. My next tire will likely be the Bridgestone Serenity.... they have some of the best reviews I've seen on tires. I also know a few MB and Lexus owners that have them and they love the quietness.
Has anyone considered the Kumho Ecsta LX Platinum? They're alot cheaper ($149 each) than any of those discussed here, and highly rated at Tirerack, just below the Bridgestone Serenity, specifically for Ride Comfort.
The other tire that fits the Genesis that gets good ratings there is the Michelin Pilot Sport A/S plus, which maybe doesn't have as long a tread life, but good traction, comfort, quiet, etc.
Kuhmo makes good tires at GREAT prices. I've owned 3 sets (one on my Passat, one on my Civic, and one on my Pilot), and each has performed above expectations and never given me any issues
At http://worldwide.hyundai.com/ they are showing the Genesis with 18" wheels useing Kumho Solos in 235/50 R18.
Also I just changed out to Hankook 245/45Z18 V12s. First impressions are the kidney brusing from rough expansion joints is gone. As is the dead feeling on center from the Dunlops. Also undulations are handled much better. Better ride and better handeling from a $151.72 (Local) tire.
PS stock rimes and tires ( less than 2K miles ) weighed 51 LBS.