For a 911 to share you time with the CSi, I would not go turbo. I would suggest to testdrive an SC and go from there. Even better would be to get the chance to drive an earlier car and also a 930. Then you really have the possibility to descide what kind of 911 really is for you.
I would guess that outright power, grip and handling is something that you get from the CSi. And that sexy look as well!
An SC or earlier 911 (the older the more so) is more about skinnier tires, less power and more about feel, rear-biased driving characteristics, less understeer, playful handling, incredible steering-feel... The less planted handling makes for a wild ride and the speed doesn't have to be crazy to have a whole lot of fun. The older the car, the lighter. Maybe that is the essence of what I want from a 911 - light weight. Not big horsepower or wide tires.