I use VMPS speakers, and VMPS passive subs. Easy to drive, great bass...and have the ability to play loudly, without distortion.
Receiver is an Onkyo 805, and two Onkyo M-504's to drive the 4 subwoofers.
Note: I just upgraded to seven channels around two months ago...it is much better than 5 channels in my fairly large room.
Dave