Looking to get a new seating, curtains and area rug. The entertainment center will stay as is due to video inputs and proximity to kitchen. Everything else is subject to change. The room is 18' 7" Long and 14' 5" Wide. What shape sofa and/or chairs would you recommend? How about size of area rug? We really don't need curtains to keep the sun out as the room is north facing and I find it is dark in the afternoon. Also the vents are under the windows on the side of the fireplace. Any thoughts or recommendations are welcome?