Best pdf reader

Hi all,

I love iBooks for the fact that I can select a word and either look up the definition or search the web or search Wikipedia. But a big drawback for me is that you can not highlight in a PDF document. And who knows when Apple will update this App.

Does anyone know of a PDF viewer that has all these features. I have tried some that do highlighting such as Acrobat Reader for the ipad but does not have the dictionary feature and I am not sure about the same type of bookmark feature.

Thanks,

John Gerard