I'm in the market for an LCD TV- hey, everybody else has one, gotta keep up with the Jonses' y'know? No, really- my TV is on the way out and when it does go south fnally I'd like to have done all the reasearch so I'd be ready to buy. Kinda looking at the Sony KDL-37M4000. But the big queswtion is- what's the difference between Dynamic and Native contrast ratio................