Never liked Ultrasports very much as they wear quickly and seem flat prone.
Paselas for the win.
Unless you can find these... one of my favourite 27 inch tyres of all time. Was recently fortunate enough to have picked up a few NOS pairs in wonderful shape... they are fast, tough, and smooth riding @ 100 psi.
Best 27 inch tyre I have ever run from a performance point of view were the now impossible to find Avocet TT30 folders... insane speed, super light, and a ride like tubulars. But they wear quickly and cut easily... although I never had any flats with them.