I dont think tht samsung is a very good brand.
Well honestly i dont know about others experience about samsung tv but it seems tht i heard a few ppl complaining about it *correct me if u think samsung is good*

Full HD depends on wat u gona use it for. If for norm tv then it ll make things worst BUT if u subscribe astro beyond (more xpensive) then its not worth while.
If u plan to connect the pc to it then full HD will be great option.

There are a few LED tvs on market now. Its a new product and u can consider this if u wan less heat from the tv sets. LED conventionally last longer but i dont know abt LED TVs.

Samsung seems cheaper? Sony is an xpensive brand? So probably panasonic or sharp?