I think you will do better just sticking to the Seabourn cruise tours. This is a luxury cruise line that cares about hiring the best tour guides.
If you can afford Seabourn - you can afford their tours. Don't try to save money by skimping on tours - you paid all of that money just to get to Ephesus.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.