If you are looking at $2800 Aria towers such as the 926, you will probably be just fine. I’m saying that the 906 bookshelves will not have a strong enough midbass for left/right (my own opinion).
The SVS will definitely have stronger bass than Focal (even with Focal towers), but they are not going to be as refined or as high resolution. SVS uses polypropylene drivers for woofer/midrange and they are not as clean/clear sounding as other drivers because the poly material has a lot of flex. It's up to you for what is more important.
For subwoofer, I would look at Rythmik subs first. I generally like ported subwoofer better because they have a thicker/meatier sound.
The SVS will definitely have stronger bass than Focal (even with Focal towers), but they are not going to be as refined or as high resolution. SVS uses polypropylene drivers for woofer/midrange and they are not as clean/clear sounding as other drivers because the poly material has a lot of flex. It's up to you for what is more important.
For subwoofer, I would look at Rythmik subs first. I generally like ported subwoofer better because they have a thicker/meatier sound.

