Best of both wolds

OK, here is the situation
I am setting up the sound system for best both worlds.
Hi-Fi and Digital surround 5.1
Here is the setup I have. Give me your inputs
I have Sony STR DE845 which is 100WX5
My Front Left/Right speaker would be Pioneer CS G404 3 way system 150 watts @ 6 ohm (not sure what it translate to 8ohm)
It got 15 Woofer
I will have 2 drive plus one tweeter Mid Channel 75 PMPO(Sherwood) @ 8 Ohm
Back would be 2 way Pioneer 35Watts RMS. Not sure what I want for Sub woofer But as of now I have 8' 150 RMS!
I want Hi-Fi for my music radio and CD.
Some times I watch some DVD so I want nice 5.1 sound tracks too.
So please tell me what ya all think :)