I'm EU, and I'll probably gonna roll on a server me and a few rl friends decide on, sorry :/ A few of them aren't comfy with non-german servers, and as for the US based servers, time's an issue, too, since we're all employed and all.
So yeah, I'll probably visit a lot (and might even change server later), but I'll stay on one of the german servers for some time. Voted for C though, because a) I'd probably rather visit the US server, if I'm visiting, and b)
with only that few EU Gaffers, I somehow fear an actual guild won't last that long - who knows how long all of EU Gaf will even stick to GW2 once that ol' WoW addon goes live
edit: Damn Naito, that's one quick edit