Any decent TV will not have ghosting or input lag. Heck, My sisters old DLP down stairs has none and its over 3 years old now.
I don't know how important refresh rate is when it comes to TVs for normal viewing and gaming, I can only expect it being important for PC hookup and possibly highend Blu-Ray viewing.
Contrast Ratio, Resolution and Black Levels are the most important, look up reviews prior to purchase to make sure the numbers aren't inflated to rediculous numbers.
This is the TV I have and I am extremely satisfied with it.