There are no easy answers to your question, as there are no standard definitions for "Contrast" or "Response Times",etc, different manufacturers use different methods of measuring most vital parameters so that they can make their TV look a more attractive option than their competitors.
Best bet is to use this site to get an idea for TV's within your budget (scroll down to the "video components" section and choose LCD or Plasma, depending on what you are looking for. There will be many options and often too much info!)
Also try this review site to get a professional view on a set you might be interested in.
If you are going to watch a lot of football, be aware that unless you use SKY HD, you will usually get a poorer image on a large screen HDTV, than you would on a normal CRT, particularly on ITV's Champions League broadcasts, which are notoriously bad. A 100Hz TV is essential to make the best of any sports broadcasts, and the only manufacturers who have managed to get a reasonably priced100Hz LCD system to work properly are Toshiba, Philips and Sony.
Good Luck.