Currently using 685 bookshelf speakers as front. Since B&w speakers are expensive, I was planning to buy them piece by piece. I bought HTM61 S2, 685 S2 with my AV receiver all at once last month with goal to buy a set of floor speakers at a later date. Now, I want to buy my floor speakers, move 685 to back and add a sub to complete my 5.1 setup. Because I listened to CM 10 S2 and liked them a lot, I was worried about paying another 4 k on speakers if I run into issues. I am new to this, so I was asking for your advice.