Hi orienzk,
Just in case you missed one or more of these … post #2 here has some links to various posts and threads that may be helpful in choosing a mattress for a child. There are some good links to various options for children included in several of them.
Yes, while this would probably be fine for a child … if you are lying down together it needs to work for you as well 
Some of the better choices I’m aware of in the Seattle area are in post #2 here.
Yes … they are one of the manufacturers that was invited to become a member of this site (see the list here) which means that I believe they are among the best quality, service, and value in the country. They also offer a 5% discount to the forum members here.
Thanks for the kind words … and if you have more questions along the way feel free to psst them here
Phoenix