There isn't much difference between the 19A350 and 19A450 except with regards to style. You'll have an increase in contrast ratio in the 19A650 with the Touch of Color design.
Hope that helps.
I am looking for a new TV for a bedroom that will be used primarily for cable watching with occassional use of DVD's. It will be located near a window, so if any model handles glare and angle viewing better, that would be a plus. I have reviewed the three available models (LN19A330, LN19A450 & LN19A650), but don't see a significant difference that jumps out at me to warrant the additional cost of the higher models. Looking for some input. Thanks.