What do you currently own as far as gear is concerned? I am not familiar with Swan, but the website is impressive. I see they moved from Canada to California. Everything is still described on the metric system. Must be a slow transition.
Here are the speakers you are talking about. I'm hoping some other members could jump in here with some advice.
You want to build a 7.1, or a 7.3 system. Great. Some of my questions for you are as follows:
-Why 7 ultra high end speakers for HT, when very little of the surround ever comes out of the rear 4th and 5th speaker, and even less from the 6th and matrixed 7th. It seems like overkill to me. Timber matching does not mean speaker matching. You just need the same tweeters and midranges. The only benefit I can see with 7 tower speakers would be when playing 7 channel stereo. Even DVD Audio doesn't use the rear surrounds quite as much as Denon's 7 channel stereo.
-Why the Denon 5805, at that price point, having 10 amplifiers seems again overkill. $6000 will buy some amazing separates. Have you even auditioned this receiver yet?
-3 subs? Why not place 1 SV Subwoofer in a corner and call it even? I would think 3 would drown out the system. For the price of three, instead, could you swing this one?
www.svsubwoofers.com/subs_ss.htm
It appears you have quite a budget to work with. In your shoes, I think I'd start by visiting several high end A/V dealers and demoing everything out there. You may be better served with separates and, say a Martin Logan surround system. Again, I have never heard the Swans, so it woudn't be a fair comparison.