Well from what I have read and seen....the picture of the LED based sets from Samsung and Sony don't live up to their lofty price tags. With the Sony LED LCD's having a PQ edge over the Samsung LED TVs -- which are of course, more expensive.
If you are interested in the best PQ and the money is not an issue as you have said, then the Pioneer Kuro Elite PRO-111FD plasma is the best route --- the 50" model can be had for as low as $3,500....