My experience is that most large screen TV's have some limitations depending on connection:
1. A VGA connection generally allows a max of 1024x768 or maybe 1280x768 (or something around there).
2. To get max resolution you need HDMI.
3. DVI output from many PC video cards will not work to transfer to HDMI on these TV's. There are exceptions but it may cause you grief.
4. Most PC output is different from Video, because of this many large screen TV's will have a PC or Video mode, this is like a slight zoom out so you dont miss the edges (menu bars can't be seen etc).
5. Most HDMI/DVI output from a PC does NOT include sound - you will need to get sound via a different cable.
6. Various people with argue with most of this. Do what you will. It will give you grief until you get it right. It is worth doing it.
Now that I have a Ubuntu PC setup beside my 50" Pioneer, I can watch just about any type of file on the large screen (need to add a Blu-ray player to it one day)- BRILLIANT !!!.
As for the Samsungs, haven't tried them, I have a Pioneer and and LG. Both are good, from what I have seen the Samsungs seem OK.