The HydroEdge are not appropriate tires for the LS. For one the T speed rating is far too low, the suspension geometry is designed around an H rated tire. For two the LS needs a smooth and quiet touring type tire.
I'd put the Bridgestones or the Michelin Primacy MXV4 on. I have the Bridgestone Turanza LS-Vs on my car, the tires they discontinued for the Serenity's. I'm happy with them, but really the quietest tires out there are the MXV4s.
You gotta be careful about TireRack's ratings. The Serenitys are new so their reviews look a lot better than older tires, and the MXV4s are widely used as OEM tires so a lot of their reviews are after the car owners have replaced the tires, so they're of old tires whereas the reviews for the Serenity are of brand new tires.
I find TireRack's ratings barely relevant.
If it were my car I'd put Michelin Primacy MXV4s on it.