Ok if your going with the Monitor II Series then do that all the way around. So this is what you want:
2 - Monitor II 70s - front l&r
1 - CS2 II - center (note the CS20 is the TSi series, so stick with the CS2 II)
4 - Monitor II 30s - surrounds & surround backs (note the TSi 100 are a different series)
As far as the other speakers for your front & rear presence speakers, with your budget don't waiste your money on them. Stay with 7.1, or 7.2 and get a decent speaker setup. The suggestions I made will save you money over what you have listed. Use that money to buy "good" subwoofers 1 or 2 whatever you can afford. DO NOT BUY POLK SUBS. Look at internet direct companies such as SVS, Outlaw Audio, Hsu Research, Elemental Designs, Epik, and Rythmic. Subs from those companies will get you the best bang for your buck.