In general, SD images are better on a plasma. And given that most people in the UK use their TV sets for SD images (by a big margin), SD images should be big factor when deciding on which TV to go for. This is a big reason why I believe that as of October 2009, plasma offers better image quality, for a given price-point.
From what I've seen LCD is the better technology when it comes to console gaming.
If gaming or HD is your priority, then LCD begins to become an option.
And these new processing engines and 100/200hz stuff on LCDs doesn't help in SD or smoothness to compete with plasmas in those areas?