First off, I just want to say that this is a GREAT forum and has been an integral part of my continuing education in HT! I wasn't sure if this exact area was the appropriate place to post my question, but here goes.... I have a Sony HT-DDW670, 600 Watt home theater system. Basically, I'd like to have more oomph and realistic bass for a sub (my current Sony sub is 100 watts) and more definition/clarity for the center channel. I have around $800 to spend and the room I'm in is 9ft, 1 inch high X 19ft, 7inch X 13ft, 3 inch. So I'm thinking of two things: 1)Do I buy a new center channel and a new sub, and keep the other sony speakers (the front left/right ones and the surrounds) OR... 2)Do I scrap the system completely for a new one? ---If I did #1, I was thinking of buying a JBL EC35 center speaker and a SVS 25-31 PCi subwoofer. My questions for this route are: a) Would these higher-end speakers overpower the remaining sony speakers and make the system sound lopsided? All the sony speakers are 100w/ch. Also, how do people feel about these components? I know everyone loves SVS, but how about the JBL for a center? b) Is my Sony 600 watt receiver powerful enough to drive these new components? ---If I did #2, which speaker systems do you recommend for my price of $800? I've seen wowie-zowie systems like the HSU Ventriloquist and the like, but are these just overpriced white elephants? ---Finally, which cables do you recommend for connecting high-end speakers? ***THANK YOU in advance for the help!