Got mine from electricalexperience on the web, not the cheapest, but they do a 5 year guarantee from Axa insurance for £150, so came in just under £1,500 delivered.
I'm not a plasma master so can't comment on a versus basis, and I basically wanted maximum bangs per buck (hence going for the 720p option - although I have read enough that it appears you have to sit very close to really notice the difference). I am sitting 4 metres back, and SD is ok, the computer through HDMI out is excellent, and watching 720p High Def source through the Computer gives a very clear picture from where i sit (although it is a little blurry at 2m).
Very satisfied with the LG.