.Vimto.,
This should answer most questions you might have about laptop screens and help you decide in that area.
Anyway, manufacturers design their laptop models to fit in certain categories and appeal to a particular type of user. Each category comes with some tradeoffs and they roughly are as follows:
Budget: the main feature here is "cheap". Usually you will get something medium sized, but neither very fast, nor particularly thin and light, nor having very good battery life. However, you can get one for around $500 USD.
Desktop Replacement: best performance and large screen size, but thick and heavy, with short battery life. As the name suggests, these are intended to replace a desktop computer at home or office. You wouldn't want to carry one with you often, and it won't last very long if you don't have a power outlet nearby, either.
Gaming: a desktop replacement with additional cost put toward a high end graphics chipset. May also feature aesthetics targeting the audience, such as neon colors and superfluous LEDs.
Thin & Light: laptops with 13-15" screens, designed for those who want a laptop they can carry. More thought is also usually given to battery life. Some performance tradeoffs have been made to accomplish that (usually in the areas of CPU and graphics).
Ultra Portable: very small and lightweight laptops, with screen sizes of 12" or less and usually without a built-in optical drive.
It would be a good start to think it over and decide which category would suit you best -- that will give you some idea what to look for, and will also make it easier for others to recommend specific models.
