My son has a 58" Panasonic THX plasma that he bought because of what you are experiencing. He did a lot of research and went to look at many different units. He didn't like what the LCD sets did with fast motion.
I have an older plasma in a relatively bright room and don't have any more reflection on the screen than I did with the old 27" flat screen it replaced. Just more of it since the screen is a lot larger.
For myself I will replace the old plasma with a new larger one. IMHO the plasma has better picture quality. LCD or plasma really depends on what works best for your own situation.