couple fo more pointers -
1. look at the contrast ratio.
Try not to buy anything with a ratio less than 1:5000...
1:10000 or higher is better still
2. Check how many HDMI slots the TV has - go for an absolute minimum of 2
3. Size of screen - depends on budget and size of room. Rule of thumb, measure the distance from the normal viewing seat to the TV screen (in inches).
Divide this figure in 2.
The resultant figure (or only slightly higher), is the largest screen size you should go for, to prevent you starting to notice the pixels.
There's no point splashing out on an all singing, all dancing plasma/LCD TV with a brilliant picture, if you end up sitting too close to it!!