I have a friend who has a 37" LCD TV and I have to say the picture is much much more crisp.
You tend to find that Plasmas are considerably heavier - although that doesn't really matter.
I personally only have a Toshiba 32" LCD, 1080P etc.
I am happy with LCD screens but you would be best going to a local Currys/Comet and comparing the picture for yourself, others see the image differently and as it is you watching the TV, you need what is best for yourself. (imo anyway)