I am using Sound King 12 gauge speaker wire from Parts Express.com for all of my speakers. As for interconnects, I have been happy thus far with the Acoustic Research Pro Series. They can be a little hard to find but are very reasonably priced.

Receiver: Onkyo 797
Mains: Axiom M22
Center: Axiom VP50 (hope to upgrade soon)
Surround: Mission 77DS
Subwoofer: Infinity BU1 (older but still kicks)

Enjoy the hobby!