Congrats on the new system. I think you did the right thing buying the speakers you want and waiting for a sub... that works out much better than being 70% happy with everything. I started with a pair of M2s and added the rest over time...

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8