You sure Mag isn't too crowded? I just spent time on wowcensus.com and discovered that Proudmore (the crazily crowded pve server I'm currently levelling up on) has 12k allies same as Mag has 12k horde (this compares to Mannoroth, where I levelled my Pvp solo toons in relative peace and quiet-except for the fact that I was trying to instance level through SM at the same time as the headless horseman activities last fall, which has 9k allies).

I would like to level some horde mages though, and the idea of an existing multi-boxer community that would loan me some starting gold is enticing (not that whoring ourselves out to people making bank guilds isn't an exciting way for every multiboxer to start on a new server)