If you are looking for something more comfortable than your Klien, I don't think any of these bikes are going to meet your needs.
The Look 555 is advertised as a great bike for crits, meaning it is going to be really stiff. You already know the Orca is going to be stiff. I don't really know anything about the SXM, so I can't really comment on its ride characteristics.
There are more and more bikes being made every year that count comfort as the most important factor. Hopefully the days of only making stiff bikes with small head tubes, so you look like Lance, are over. Examples are the Bianchi C2C, Trek Pilot and Specialized Roubaix. From your choices though, I assume you are looking for something more exotic. I can't help you there. But if I was looking for something exotic and comfortable, in that price range, I would go custom steel.