It must really depend on what you're looking for/doing. My favorite is http://getskeleton.com/ http://getskeleton.com/. I'm a noob, but I like that I can unders

It must really depend on what you're looking for/doing. My favorite is http://getskeleton.com/ http://getskeleton.com/. I'm a noob, but I like that I can understand and completely customize the 400 lines of code (https://github.com/dhg/Skeleton/blob/master/css/skeleton.css https://github.com/dhg/Skeleton/blob/master/css/skeleton.css) easily.