CTS AWD has a driveshaft going through the oil pan.
The Volvo S80 regardless of motor choice is a great car. Obviously the S80 V8 AWD is a quick car and simply amazing to drive. The T6 AWD model is also extremely nice choice.
Your looking at around $39k for a nice T6 AWD model new.
Also, with Volvo right now your looking at the Safe and Sound plan for 5y/60,000mi for maintance,warrenty,wear and tear. It also has the Haldex AWD system with preloaded diff meaning instant traction when slip is detected.