Maxboy00, thanks for the response which is appreciated. That's it. It would be the REL. A friend who is the hifi industry also advised that REL is a safer bet than the SVS. Similarly I wrote to REL support but my story was a little different. I was hoping they would endorse the T9x I was looking at but the tech advised that the model is not good enough for my speakers. The S510 and S812 were recommended instead.
I too think that SVS will be better for Home Theater while the REL is more appropriate for music. It's good to hear that the S510s integrate well with the main speakers in your system.

