Bernard,
I am sure you will be pleased with the 805's. I have not heard them, but many people like them. Most importantly, if you like them you can't ask for more than that.
I wonder if you are aware that the sub does not need to be the same manufacturer as the main speakers. You can pick the best manufacturer for speakers and the best for subs.
I have never heard the sub you mentioned, but you might be able to do better from subwoofer companies like SVS, Hsu Research, Velodyne, or the Axiom EP500 or 600 to name a few.
In the end, pick what you like the sound of.