It will be difficult for you to decide on the color, so it will be better if you check out Fabric Sofas . Here you will definitely find the sofa of the color you need!
Lighten things up a little so your couch doesn't look like it's hidden in the carpet. go a darker beige, but not to the value of the browns in your hardwood and couches. think white chocolate with a bit of dark choco mixed in. or just do whatever you feel like doing ;) cheers.