I've been in the Signature Audio Video in Stittsville myself, its where I picked up my Velodyne DD-15. I talked with a few of the guys there, before they sent a guy who was very knowledgable to deal with me, I guess they gathered I was a bit more informed then the average electronics consumer. Anyways I spent a good 3 hours or more in there talking with this guy and testing out some equipment. In the end, I ended up buying the VSX-94TXH Pioneer Elite receiver and the Velodyne DD-15. I got a huge discount on the Velo from them because they had used it previously as one of their theatre room demonstration pieces, and I haven't regretted the purchase at all. I have it in a pretty bad spot (due to room layout constraints) and the room is 12x14x8. With one side of the room opened up for a little main door entrance, a stair case and another adjoining doorway to a hall. Even with all of this, the calibration equipment included with the Velo had my optimized in roughly no time at all. The sub is quite powerful, and can easily shake my house down if I turned it up.
I mightve gone with something else had I done more research before hand, but all things considered, I felt the Velo integrated better with the Studio's that I have then the Servo 15 did.
At the end of the day I thought Signature AV was a really good store, good service, and great follow-up. They called me up, a couple hours after I purchased equipment to make certain my drive back to Petawawa went good, and that I had no problems with the equipment. Then they called me up again at the end of the week, just to confirm all was good.