With a room your size, I would get two SVS PB 2000's to better cover and equalize the room out. If you go with one sub, then I would get the SVS PB12 Plus because the Rythmik F15HP is on backorder for 6 months per their website.
Sub first, then the 8080BP's for surrounds/rears.
It looks like only the Rythmik F15HP in piano black is on backorder but the black oak grain and black matte finishes are available. Assuming availability, you'd recommend the F15HP over the single SVS PB12+ or dual SCS PB2000s or still the dual PB2000s?