I thought this was discussed just recently but can't seem to locate the thread. I think the general gist was there is no markup on TV's, you won't get any better deals than in the shops. Go into the shop and have a look at the different models, if one takes your fancy then find the best deal and take it home. If you just prefer to buy on line then most shops have online purchasing. +1 for JB's for trouble free in my experience.
Always be yourself, unless you can be Batman, then always be the Batman