i went to the bestbuy/magnolia yesterday and the salesman told me i shouldn't get the bipolar towers since my ht room has only three walls (back wall opens to rest of basement). He recomended the PM series. So i looked into it and i found two good bookshelfs i like, the PM900 and the Paradigm studio 40. I've heard good things about the studio 40, but i haven't seen much on the PM900. What are ur opinions on these speakers?