when I was looking at the yamaha ns-555 series, i was comparing it to Infinity Primus 360. like sheep said, you should look for similar offerings from energy and PSB ...but you should LISTEN to all of them.
how much is that sub in CAD?
I presume you'll be using this setup, mostly HT?
how big is your room?
and no, it is not necessary for the brand of the receiver and speakers to match (in case that was what you were thinking)