I've switched to tubeless when I built my G6 a couple of years ago and I've tried a few different tires with varying success.
Wheels are Mavic Comete Pro Carbon UST and my favorite tires so far are the Zipp Tangente Speed RT25's. They're easy to fit, easy to remove if you need to fix a flat or install a tube on a ride, and the grip and feel are both excellent. They usually last me about 2,000 miles.
I recently tried a set of GP5000 TL's but there were near impossible to get on the rim (and I install my my motorcycle tires by hand).