First ... I would ask the people you're going to get the granite countertop from. Mainly, because there is uaually a "limited warranty" ... and they will be able to tell you what temp is within "normal useage" range so that you're not abusing the countertop (aka voiding the warranty).
Second ... can your pan handle going from a hot oven directly onto a cold slab of granite without warping? Pyrex, ceramic, or Corningware could shatter ... thinner metal pans could warp.
It may be that you will do more damage to your pan than the countertop!