If you’re looking at Horde, I’ve heard good things about Thrall being decent for the raiding scene.
For Ally, you’re already on the busiest server for your faction. Noticed after I checked your profile.
A recommendation I’d have though, would be to skim the server forums and/or the recruitment forums (link below.)
You might find what you’re looking for before you throw down the money for a transfer.
Best of luck to you though. I’d just avoid Illidan like the plague, but this is just my opinion. It may be somewhat bias.
Edit: Just saw this, Horde guild looking for a tank.