For new construction, I charge $75 per volume control, and $75 per speaker to rough in. So each room would be $225 and surround sound room would be 375. I use 14 gauge speaker wire for everything, as it's not worth stocking both 14 and 16 to me. I pull 14/4 and Cat 5 to each volume control, and 14/2 from vol. control to speaker. That way they they are set up for just about anything in terms of equipment. Keypad control or plain old volume control, as well as IR.
For finish I typically supply all equipment, and pricing includes installation and all cables. We usually custom make our RCA cables for a clean install. I don't use Russound, but have heard it's good equipment. For higher end multi-room/ multi source audio, I use Nuvo products for amp/ controller. I use Jamo speakers and Harmon Karden or Yamaha receivers. For lesser budgets we just use a receiver sometimes with an external amp with impedance matching volume controls in each room.
Will you be supplying equipment. If so, I'd price it as a contract price for entire job. If not, I'd price it T & M.
If this is your first A/V job, consider it a learning experience.
If you're interested, my distributer is located in your area. Newington, I think. He doesn't sell Roussound, though if you are sold on that brand.
John