5.1 Theatre system approx 15m2 - Forum

What speakers should I begin to build a 5.1 setup with? Ive thought about 3x 8340 and 2x 8030/8020? What sub?  The space is approx 15m2... In the music room we use 8341.

Or

2X 8340 1X 8040 and 2X8020 (enough?) and what sub?