Well no matter what to keep a knife sharp you must realign the blade before each use and before you store them using a sharping steel (No it doesn't actually sharpen) and you really don't sharpen knives often, however I suggest going to a professional to do so
However I would suggest Wusthof knives or Shun knives as those are the ones I use, however they are expensive, but extremely high quality
If you don't want to spend this much just shop around, look for a forged blade (Not stamped) and you want the blade to run down the lengh of the handle