Are you sure you want Prologic? Not many TVs have it these days and none that I can think of below £500. I'd strongly recommend buying a basic but well designed TV such as this http://www.comet.co.uk/comet/html/cache/453_210064.html for about £300 and spend the rest of your budget on an entry-level AV system that you can connect to your TV. (Pricerunner is a pretty good starting point for both)