For me it is not just 1 player. There are several players that I very much like.
Among them: Mustaavalkosta, Bazza, Nicole, dreis, Bullbars, MntrX, Murador, zavva, Entropy, Nazqil, MaVeRiXX. I think there are even more than these people, but these just came to mind
What they all share is that they are all socially skilled, smart, not egotistical people. That makes a good galm8 for me.
Last minute addition: I think Crowly (and many other Orbiters ^^) makes a good galm8 too, although he is a Briton.