I went though the same back in 2008 when shopping for LCD.
The disappointing aspect is that manufacturers aren't so intere$ted in improving the current (whatever-it-is) technology, because sales would be limited to the people who have not already bought a flat panel.
So, most people won't shell out a large sum of money to replace their working LCD sets just because the new one has slightly better PQ. They might, however, if it's got new features or tech. So, IMO, quality is in fact negatively affected by the *need* of constantly bringing something new/different to the table (to drive up sales).