The PDR10 is a powered sub so as long as you have a sub output on your receiver you will be fine.
I have the PDR12 and love it.
What are they asking for the 10? That is important.
Most people that populate these forums prefer the SVS sub over the vast majority of subs out there.
Overkill depends on what you consider it to be.
If you listen to a lot of music in the bedroom and the Atoms are the primary speakers then the sub will be a great compliment for the Atoms output.