Thanks for your reply Vincent.
Do you know if the 42LE5900 uses the same engine as the 4500? Although I wouldn't imagine so as the 4500 is only a 50hz.
By reading your reviews on most of the 2010 TVs it seems that the more basic they are in functions the lower the input lag tends to be. I'm sorta hoping this is the same case with the LE4500 as it's a low end as well.
Once again, thanks for your help.