19 inch tyres for 2008 Boxster

[purple haze]

My current Bridgestone Potenza RE050A (N1 rated) tyres need replacing. I've been offered a good deal on Michelin Pilot Sport 4S tyres which I understand are not 'N' rated but which the motoring press seem to think are very good. My insurer is happy for me to fit the Michelins.

All views greatly appreciated