I had originally intended to mount Michelin Pilot Super Sports on my staggered 21" setup (245/35/21--285/30/21). They're great tires and well-priced. Unfortunately, my installer could not get hold of the PSS's in the right size for the fronts. We both spent weeks trying to track a set down and I know there is a shipment coming over on the boat in the next couple of weeks that might have a set of 245/35/21s on it. In the end, even though I was willing to wait, I decided that mounting a set of tires that were so hard to find was a really bad idea since a blown tire (which happens all the time with 21"s) could potentially disable me for weeks or months unless I wanted to pay to mount my winter set while I waited however long it took for a replacement.
In the end, I went with a set of Continental Contisport Contact 5s in 245/35 ZR 21 (96Y) XL in the front and 285/30 ZR 21 (96Y) XL in the rear as they were the only max performance summer tires I was confident would be available if I ever needed replacements. They are very good tires that take the Model S to a completely different level of handling over the stock 19" Michellin Primacys. I did not spring for the Contisilents but I do not find the road noise exceedingly loud. Are they as good as the Pilot Super Sports? In my mind, not quite, but I know I can get hold of a replacement tire in a hurry if I need it. When your choice is your second choice tire vs. potentially walking, that's really no choice at all.