The Sony SXRD is a 3LCD system, similar to that of the JVC HD-ILA. Except, Sony has taken it beyond. I'm a huge fan of LG/Zenith, as we're resellers for them (as well as other brands such as Runco, Fujitsu, Meridian, Lexicon, etc.) but nothing they're currently offering really compares, not even their plasmas.
We have a 55" SXRD in our office as a demo, and once we had it ISF certified, the clarity and video quality is astounding. The Superbowl never looked so good. 🙂
Sure, Zenith's warranty may be a bit longer and/or more comprehensive, but I, personally, am more concerned with quality over warranty.