I just purchased the Toshiba TN50X81 rear projection unit. It is a 4x3 set that is capable of displaying 1080i in 16x9 mode. I couldn't justify the 16x9 display at this time given that a majority of the sources I'm watching are still still 4x3. I also had a width limitation based on the built-ins in my room. This unit provided the best 16x9 viewing area that I could squeeze in anyway.

One thing I have noticed is that a bad source looks even worse on the digital ready sets. It seems that the up-conversion adds additional noise to an already bad signal. I noticed this on all the sets I looked at. If your out previewing, be sure and get a demo using the source you'll be using, not just that swoopy 1080i signal!