Not a big fan of O-rings at all, but I would recommend the reds, they were the only ones I could stand.
I love blacks for gaming, typing is ok but from the WASD sampler the blue click feels like it will be much nicer for typing, browns felt like gritty rubber domes to me, but maybe a whole board would be different.
Grabbing a couple of blue boards soon, going to mod one to greens or ghetto greens, I love the weight of blacks and the click of blues so ghetto greens should feel awesome. Want to see what the real 80g greens are like though as well.