I like the Kumho ASX 225/50-16 the best out of everything I see… There are SCCA Street Touring people who were using this model a few years ago and doing fairly well with it (before the ST tire race sort of ess-ploded…) The Bridgestone RE970AS Pole Position and Michelin Pilot Sport AS Plus would be the others I would look at, based on tread pattern… That Conti looks like lots of very small tread blocks to squirm around to me…
Charlie