Sonus Faber Grand Piano Home

In a previous post I was looking for input between B&W 803, 703 and Monitor Audio GR60 and someone suggested checking out SF GPH, which I did at the local Hi-Fi Buys. The soundstage and imaging were incredible but the bass wasn't very tight. Of course, the electronics weren't the greatest and the room was horrible. I might try these but first I have a couple of questions: I noticed that these are 6 Ohm speakers, what are the implications, will it work ok with my 200 (@8, 400@4) WPC Sunfire Ultimate receiver? It didn't offer bi-wiring, is this something I should make sure I get at this price point and above? Any other input on these speakers, the center channel, and the rears would be appreciated.