I would have to agree that there are many great websites. I have specific websites which I depend upon for very specific things. For example, when I feel like laughing, YouTube is the site I always turn to. If I am looking for quotes, I love "ThinkExist." GoogleScholar is a site I use for research. I have to agree that Wikipedia is a site that I visit in order to get me headed in the right direction (while I do tell my students to stay away for the reasons posted above).
Therefore, there really are many sites one could consider the "best."