I'm not a TV buff mate, but the right make is always a good place to start, imo google the Make and model and look for views/reviews on the TV, alot of the sites will have FAQ's about contrast ratio n ting
its also different components, some cheaper, some not.
24" its nice size, and it gets up to 1680 x 1050.but it is just too expensive imo, when you can get much cheaper 22".
im looking to get a pair of Dell 22", around £150 each. the 24 model is £270, and the newer version £380. just too much money for that extra size, not worth it imo.
i wouldnt get a £200 24", its too big and nay flaws will stand out loads.
there's the edge 22" monitors, for £125 each, and i have had the 17" for couple of years, but i aint too impressed, and for that small difference, you might as well get a brand you know off!