Hey mate, I'm around right now

I run on Khaz'Goroth (Alliance), Caelastrez (Alliance), Barthilas (Horde) and Kil'Jaden (Mixture).

If you're in bloodlust, I think the realm that most boxers play on is Kil'Jaeden Alliance, Legion of Boom rings a bell

Also, forum search 'The Zerg', I think they're one of the most active PvP Boxer guilds today and on Magtherion or something similar. They are horde though... :P

If you're just after guys who are skilled PvPers to assist you in a game and work as a team, Khaz'Goroth is the best though. We have one of the most active PvP groups and vent is up for at least 6 hours a day running randoms, CtAs, LFRs and Heroics. We also run low lvl BGs with loomed toons