I just pulled the trigger on purchasing a JVC 56" HD-ILA (Model HD-56G786). I did a ton of research on what features (not all display!) that I wanted in a TV of this type (LCoS) and did some "screen testing" in the stores. The problem is that the TV is on backorder and may not be available for at least 5-7 business days (possibly longer). But, good things come to those who wait, right?
I also purchased the DVE calibration disc which I should get this Thursday - I have the S&V disc but I believe the DVE disc is better for HD TV calibration, and will soon be subscribing for HD service.
Anyway, just thought I'd mention that I have recently joined the ranks of you big screen folks.