CreeDo,
Believe it or not, the OB Classic Pro (now just called the Pro), hits firmer than the Classic. This is because the hole in the middle of the shaft is smaller, so I believe there is a higher wood to space ratio. Also, the deflection is quite a bit lower, so this may be the best choice overall.
KMRUNOUT
The classics do not have a hole in the middle. Thought you should know.