Both are the same (in terms of rez) only different technologies which have their very own pros and cons.

What is your main usage?

On paper, Samsung is the best with Gaming mode and high dynamic contrast ratio. For those who like rich color, then this is the one.

Sharp and Panasonic only loses out a lil in contrast but Sharp's PQ appears to be more natural while Panasonic's black level is superior. Both come with 2 years warranty while Samsung is only 1 year.

Sharp and Panasonic panel are renowned for its quality.

else, might kena the 'black face' treatment from some impatient salesguys

If you are to buy Sony S series, I suggest that you take a look at other LCD TV such as Sharp and Panasonic.

S series is expensive for its features. PQ aint the best around too.

PS3 can be connected to HD projector via HDMI (for best result). I am doing this now.

Basically all LCD TVs are HDTV. HDTV is actually sort of standard for all tvs that are HD (min 720p).