I know that you mention this to me maybe a week or so ago and I really love the idea. My only suggestion would be to start it off as a specific class and not build, this is only due to the expense of having to kit your character out all over again if you do have the build in question. But I would love to see 15 Rangers causing havoc with the GANK tag, would be great fun!
I've been thinking about this idea, and realized if we're gonna have a full Necro group, I might go a different power build. I was put up against a roamer Necro when I (as a zerg wells necro) was training with someone else...and holy crap he rekt me. So I'm gonna be trying out another Power build, and hope to have someone who wants to duel in PvP! Not only that, but for all other classes as well.
Another idea just spawned. Lol, how do we get ourselves a PvP room? I've never looked into it.