Yep, Mag is doing well if you are horde, but if you are alliance, I'd hit up Kil'Jaeden. Sounds like they have as many good things going on over there as we do on Mag.

They were definitely the first to start raiding 25-Naxx and from what I've read have done pretty well.

Though last weekend on Mag we 3-manned Naxx 25 and actually had very good success. It's very fun to cruise through content that was made for 25 people with only 3 of us.