Just go demo everything and ask about return policies. Most people on here would never recommend ANYTHING from Best Buy/Mag stores. Unless your getting crazy good discounts or have alot of free gift cards, I would look else where especially like everyone mentioned the Internet Direct brands.
BB/Mag doesn't carry a single subwoofer I would ever consider. Unless I could get one of those Martin Logan Decent/Depth triple woofer subs, at a good discount.