Spunky, did you get your cc-100 at Future shop? I can never seem to find them anymore.
You built a very similar system to mine, over the same period of time too. I got all the same sales as you too, except I went with the c-300's because I got them for $199 for the pair, but I had to pay shipping so it came to like $280 for the pair after tax and shipping brand new. Still I saw that as a better deal than anything I ever saw the 500s going for, and it's pretty much the same speaker, probably not quite as loud. My ESW v10, I got for $450 AFTER tax, but I didn't get that one at Futureshop. And I went with the Yamaha htr 6160 reciever, as I, similar to you and your choice, felt it would last me many years for home theater, and it had all the new decoders and stuff.
Also, Why build the 7.1? ... Nothing supports 7.1, few movies even support 6.1, and you need a very large room to do it properly. You could have put the extra money into getting the ESW V10 instead of the ESW v8. The v10 was on sale for $499 at FS aboiut 2 weeks ago. Normally $879.
You will never get 7 channels of discrete audio in your 7.1 setup. so why bother?
I am actually moving into a bigger house, so I am going to use my old Center channel as a rear for 6,1 (If I can find the cc-100 for my new center). At least than I will have 6 discrete channels for movies, well ones that actually support 6.1.
I am just not a big fan of the back two speakers being shared mono. And like I said, it's about money too. A better sub would do more for your home theater than the back two mono speakers which hardly anything even supports.
But to the original thread question, I think c- series offers a better bang for the buck right now if you get it on sales so that might be the way to go.