Go to
TireRack and select 'Start Shopping'. Then put in your car data. Go ahead and select runflat in the additional info. That just sets your current wheels as default. You'll still get recommendations for non-RFT tires. Enter ZIP code and select "Tires", then View Results.
On the next page select 19" and View Results. Then go crazy reading recommendations, ratings, and test results. Most people opt for Pirelli, Bridgestone, Contis, or Michelins.
And pick up a tire mobility kit and a plug kit from Amazon just in case.