Hi Gerrardasnails
Are you thinking on the lines of having a projector in place of the sony you have..? would the projector be for viewing all sources ie sky-HD Blu-ray Games etc this can be a bind if you want to watch say eastenders or the news it would mean having the screen [ extra cost ] down all the time, if however you would use the projector for filming and games it would be difficult to buy a projector that can better a good plasma, but you can get pretty close, the panasonic PT-3000 comes to mind this has had great reviews and is also LCD so you would not suffer rainbow problems, also the Infocus fairs well to, Clare Newsome has one of these and rates it very highly, and both can be had for under £2000 if you shop around, hope this helps.
Andy