I wouldn't put the Kumho tires on the car personally. A W rated performance tire might be nice on a GS with 18" rims, but its way overkill for the ES.
I have the newer Michelin Primacy MXV4 tires on the vehicle...and they're the only tires I'd shod it with. I've had other Michelins, Bridgestones, Toyos, the Primacy is what you want. Not the MXV4 S8 that comes on the car, the Primacy MXV4.