In my opinion, PSB and NAD are absolutely wonderful together. I have the combo and I love it. But, it is tough to suggest surround speakers without knowing what kind of speakers you have in the front and center. It is usually best to have the same brand/line of speakers throughout your system.
Also, the 10s are bipole speakers. Depending on what your needs are, you may be better off getting a direct speaker like the Image 1B. Bipole speakers are generally accepted as being better for movie watching, but many prefer direct speakers for music. So, depending on what your needs are, you may want to keep that in mind.