There was a thread last year on Houzz international discussing how the quality of foam has gone down, doesn't keep it's shape as well on new furniture. Better sofas can come with a warranty, have you checked yours and what it covers; eg frame only ?

I also agree with the neutral lounge to be jazzed up with coloured pillows and such. It won't be too much with your feature walls plus, if your taste changes, you paint or you move down the track, the beige will be a lot easier to work with :)

Congratulations on your new home. I think you have been very sensible to live in it for a year before starting your decorating, it has given you time to consider the lighting and aspect of each room in all seasons as well as time to evaluate how you want to live in your home and exactly what you need. The lounge does look very big and bulky and will definitely dominate the room, so I would keep to the lighter colour. Don't worry about the kids and dirt - as Kookykaren said, leather cleans easily - sharp objects and textas are your bigger worry regardless of what colour you choose. Laying newspaper on the floor to the size of the lounge is another way of checking how it will look as it gives you a better indication of bulk than tape. I would keep your ottoman simple (one with storage is an excellent idea with the children), just a tone on tone fabric or a pattern using the colours in the rug on the floor of the photo of the lounge. I don't think you have room for too large an ottoman but I would have a square one made the same height as the lounge so when just you and DH are watching TV you can push it against the other end of the lounge and both have a chaise. You can then bring some colour with art work or some patterned cushions on the lounges.

couches, angled island, powerpoint on island are good bt having dining table so far away frm kitchen not practical...I can imagine a tiff everytime the table is to be laid...who is going to ferry all the food and cutlery up and down?