I just bought a new Panasonic Plasma the other day. The thing is, I also just bought my first TiVo (the Series 2) back in May. My question is, should I upgrade to one of the new TiVo HD boxes? What's going to happen if I try and TiVo something on the new TV with the old box? I assume I will be able to TiVo SD broadcasts, but not HD ones, right? Also, what are the major differences between the $800 HD TiVo box and the new, lower priced one? Thanks in advance!