Re: POG (Prince Original Graphite) or Wilson Pro Staff
if your using the prince tour graphite 107 then it would be a huge jump to the kpro staff, which has a tiny sweetspot and is very demanding. the people that buy that racket are either pro staff afficiondos or posers.
the new prince graphites, on other hand, are great. they are the first prince rackets i have liked in about 5 years. i havent hit with the mid as its not available in the uk, but the 100 is amazing. you dont get any vibrations from it but you can still feel the ball on the stringbed. its an absolute spin monster and the control is awesome; i never hit long with it.
from what you've said i definitely think the new graphite 100 is the frame you will like best out of the three