First, all knives dull and then you must sharpen.
There are services that do this for you if you want.
Second, there are different styles and manufactures depending on how you cut.
Two main categories are Japanese, thin carbon steel laminates in most cases for very fine cutting. Usually a hexagonal handle.
Western Chef style blades, moer and more a rust resistant hi-Carbon steel but carbon steel is still available. Carbon steel will rust if not coated with a preservative and HiCarbon more slowly. Usually Stainless steel will not rust, keeps an edge a long time but hard to sharpen for mortals, usually cheaper knives.
For Western style my personal favorite is Wusthof, the largest range of any manufacture.
There are different lines within Wusthof from low to higher priced starting with stamped no bolster knives ranging to forged bolster knives. you get what you pay for.
http://www.wusthof.com/Dexster-Russel makes a Sani-Safe line which are a good value of which I have a few.
https://www.dexter1818.com/shop/sani-safe.htmlFor Japanese style the best is Hamono Takeda.These are forged composite blades and the best of their type. One of the sharpest blades in the world Takeda can be found at Knife shows diligently sharpening his blades by hand on water stones. Not for an amateur as they can really bite but the cut is fantastic.
http://takedahamono.com/eshop/hocho.htmlAnything more expensive is truly custom and prices are high.
Hope this helps and stay away from any TV advertised knives.
Lastly, many consider themselves experts.
So determine your style and budget and what type of blades you require, and get yourself to a Shop like Northwestern cutlery that has a good selection of knives.-Richard