Modern Sofa

I am planning to buy a modern sofa bed but I am not sure what kind of fabric should I buy. I want to much with my curtain and would go together, I hope with a beige sofa will match the color of my curtain. I have wall to wall windows in my living room, the walls are white, carpet is beige and I have an antique piano. I have searched on the internet about sofas but there are so many to choose. I don’t know which color should I get.