Who is the best hitting/most powerfull hitting pitcher you've seen live?
On the Cubs last trip to GABP in 2006 I saw Carlos Zambrano hit a homer to the base of the "power stacks" and it was a total rocket. He's a big fella to begin with but it was a 100% shot.
So of the various pitchers you've seen live who are the ones that stand out either as "power hitters" or, at least, very good hitters.