My guild started on Anchorhead (where BioWare put us) but after a few days of crappy queues we re-rolled on Gardens of Talla, a brand new server.
On Anchorhead I had gotten my BH Merc up to 27 we before re-rolled.
On GoT my BH is up to 26 (went PowerTech) and also have an 11 Agent (Operative) and 11 Inquisitor (Assassin). My Warrior is only up to 9, I'll probably go Marauder with him.
We were resistant to re-roll but when Stephen Reid said that the queues would remain for the time being we figured we mine as well just change servers while we were all still relatively low. A week later BW announced that they were going to aggressively work on the queues and, as far as I've seen, our old server doesn't have a queue anymore...