There is an older thread, maybe from last summer, where several members bought the G-Max's and IIRC, they were impressed with them. Now that i think about it I'm sure the Conti's were discussed as well and seemed sloppy (weak sidewalls) to some.
On a personal note about Kumho's, I'll never buy them. My roommate had them as OE equipment on her Accent and were at the wear bars @ 25k on a 60k mile tire after 4 years. The warranty would have been prorated at that point, but Kumho did not honor any part of it because "she didn't buy them, the dealership did." Whether that was the official answer or just lazy unprofessionalism by the certified dealer in my town, it was enough to guarantee I'll buy something else from someone else.