If price is involved in this conversation, which of the four would be the best bang for the buck? I'm certain the B&W's are quite expensive, same with the MA's, but I have not checkd on the Polk's and the PSB's recently, mahal narin ba?
You are gonna spend almost the same if you are going to complete the entire set. The A9 may be more expensive than some of the other floorstanders but then it's bookshelf/surround and center speaker can be cheaper.
I would suggest you audition them first so you would know which sound you would prefer. Then think of the price later.
It's better to get the speakers that your ears want rather than having that upgrade itch later.
What Hifi in Makati Cinema Square carries Paradigm, MA, B&W and PSB, while SnS in Shangrila has Polk and PSB.