If you are happy with the picture, and you can return it if you are not happy, why not?
As far as sound goes, if you have optical/coax out of the TV, you can always get a 5.1/6.1/7.1 sound system to fix it up later & disable the TV’s sound, although this will double your electricity bill associated with the TV.
Obviously it has a few HDMI ports & etc, I reckon 2 minimum is required - and of course DVI & etc …
What’s the HD tuner like? - Can you plug the antenna/Matv system into these TV’s without going through external tuners & whatnot?
Keep in mind that most new DVD players (and of course BD players) upscale SD video to HD … before it reaches the TV, and most TV stations are either already, or heading towards, HD broadcast, so the upscaling circuitry will only be useful for the next year or two anyway
Personally, I would say give it a miss, but I tend to pay $$$ for higher quality stuff & warranties, because I work too much (and get paid for it) & want to really appreciate my life outside work.