Keep in mind you can order from the factory outlet and save 10%. Also, using phantom mode your left/right mains can simulate a center. So I would hold off on the center for now and focus on either surrounds or the sub.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85