The two most popular sanitizers we use are 1) iodine based ones called iodophors, and 2)acid based ones, the one many used is called starsan.
They're both popular, effective and excellent.
I put a lot of good info and tips of effectively using sanitizers in here. Including a podcast by the creator of starsan, and one by a rep from iodophor talking about that and more-http://www.homebrewtalk.com/f39/sanitizer-question-54932/
Starsan and Iodophors are both wonderful sanitizers. I have both on hand. One is no better than the other. You just have to figure out which you prefer.