I believe SVS offers free returns also. That way you can really compare subwoofers.
SVS, HSU, and other ID brands will have more "street cred". They may outperform these $400-$800 subs from Best Buy in terms of output/THD measurement. If that is important to you, then just get SVS or another ID brand.
But if all you care about is the ACTUAL subjective sound, then compare them for yourself.
You have B&W for surrounds. What are your front speakers?