On a side note:
If you start over, it will be several weeks (a few months) before you can contribute to a heroic Rancor/AAT raids. If you keep your current account you can keep farmin gear from there. You can contribute more in TW and TB and join a better guild with your current account and have better rewards than if you start over.
If starting over, you will have an advantage in your squad arena, but that's about it. On your old account it may take several months (4—6) to reach top—200 again, but when you do, you will have a better roster than if you start over.