Another vote for GP4000 S. Superb tyre, light, good grip, good puncture protection. I had some on for about 2000km with no issues or punctures.
I just bought some Mavic Ksyrium Elite wheels which came with Mavic tyres. These tyres seem pretty good too and haven't punctured to date, but I have my Conti's in the wings in case I lose confidence in the Mavics.