Why have a $1500 AVR with a set of cheap speakers. Cheap speakers will still sound cheap no matter how much you spend on an AVR whereas good speakers will sound good no matter how little you spend on an AVR.
I realize you spent what you did in order to have a full Atmos system, but why compromise it with cheap speakers and a bargain basement sub?
Buy a good pair of mains, then save up for a good sub or two then get a matching center and finally the surrounds.
Klipsch RF-62II, RC-500, RS-400, SVS PC12+,
Def Tech SC8000
Harman Kardon AVR 1600
PS3, Apple TV, Sharp 70" Qattron