Best surround sound system w/ USB port

Yesterday, I went to BestBuy to check on surround sound systems and noticed some of them have USB ports. I was looking at the Sony Bravia DAV-DZ170 and noticed it had a usb port. Will this system let me plug a portable drive to it? Or will any others? and let me play mp3 files/mp4/wmv/divx format songs and videos?