My criteria for a good lcd tv for astro would be one that lets you fiddle around with aspect ratios since everything is being broadcast in 4:3 anyway (There are some exceptions though). So something that lets you stretch to 16:9(10?), crop or show the picture in it's original aspect ratio would be great.

The image quality is going to be low res anyway so it's not going to be the prettiest picture anyway. It'll only shine once you get to DVD picture quality level.