How many films is it really possible to be an expert at using?

I'll be posting a survey on Twitter, but I wanted to give my non-Twitter followers a chance at answering this question.  In the future I will write an 'article' here on my feelings and the results of my survey.

So let me state the question:

What films do you use and how many do you feel it is possible to be an expert with?  Please leave a comment or vote on Twitter @AnalogPhotoBug, and look for the future article.

The films I Typically Use.