I would just add another pair of e5bi's, they are only $225 a pair and I doubt you will notice the difference between them and the bi pole design in a positive way. I have 5.2 and mount my surrounds on the ceiling it works well, I don't like 7. for a few reasons, but also it won't work in my room because of the seating location, but if I did like it and my seating would permit it, I would run bookshelfs for surrounds and rears...