I went in this order...
1.) Telos
2.) Dantooine
3.) Nar Shaadaa
4.) Dxun/Onderon
5.) Korriban
6.) Telos
Actually, I was pretty disappointed with Korriban. In Knights of the Old Republic 1, it was teeming with life and had nice weapons and other stuff to offer for sale. In The Sith Lords, seems so dead. Also, too short.