Thanks for the quick response! I mainly want to add all of the newest Audio codecs (DTS HD etc...). Also I want to add more hdmi and optical ports. Currently my HTIB only has one optical in port and no hdmi in ports. However, I have a ps3, xbox360, and a cable box that I want to all have surround sound for. My main reason for wanting to upgrade is that I have noticed some of my blu-rays only do surround sound in DTS, however, the LG LHT764 cannot decode the DTS signal quick enough, thus voices do not match up with the video. I have tried every option imaginable for the ps3 and the LG to fix the problem, but nothing works.
I definitely don't need sound that is absolutely amazing and will rattle my apartment, but I do want something that sounds good.