You don't necessarily have to buy the most expensive, but you definitely want to buy quality. This site will teach you what it is, what it does, what to consider when buying cooking tools.

WÜSTHOF precision forged knives are goods of only the highest quality. Painstakingly manufactured these knives are pure fun to work with and will turn even the preparation of a dish into a culinary pleasure.
Each one of the WÜSTHOF knife series has a different ergonomic handle design which offers a comfortable feeling for all different likings.