Hey.
My uncle just changed all tires on his ES300, he has Toyo Proxes on and I drove it for a few weeks, I really liked the way they handled. Only downside I could pick out was they were noisier than others (road noise)

Can't got wrong with Michelin's... but Kumho's are actually not far from it. If $ is the factor, I'd lean towards the Kumho's... if not then definitely Michelin's/Potenza's.