I don't think you can talk about turbos without also talking about props. In my opinion, the turbocharged engine badly wants a constant speed prop. If your decisions are budget-based and you can afford either a turbo or a CS prop (but not both), choose the prop. The exception would be if you absolutely need to take off in 50', which is a very slim minority of pilots. It's true that nobody ever wishes they had less power, but whether you really get value for your dollar with a turbo depends upon where you're based and what your typical flight looks like. It does seem like a lot of new builds are being done on a "Money-is-no-object" basis (I'm sort of guilty). But don't let that push you into thinking you need things you don't. To break it down:

Normally-aspirated/Fixed-pitch - A perfectly capable airplane that will go in and out of almost anywhere you're likely to go.

Turbo/Fixed pitch - You'll likely pitch your prop for climb. Incredible takeoff/climb performance, but when you push the nose over in cruise, you'll have to pull the throttle back into unboosted territory to keep the engine turning below redline, so the turbo does nothing for you most of the time. Also, in turbulence, you'll be chasing RPM with the throttle all the time as the Kitfox rides every up and downdraft like a rowboat in an ocean squall. When you need to climb though, you'll have performance to spare.

NA/CS: Really comfortable airplane to fly. No chasing the throttle setting, and you get to squeeze all the cruise performance out of your engine. DA will affect you, but will seldom keep you from going where you want to go. And in cruise, you'll absolutely run away from your FP friends, even if they have turbos.

Turbo/CS: The best of all worlds. Outstanding takeoff/climb performance, and great cruise speeds. You get to make all your power at altitude, and your prop will let you use it. Even in the mountains, you have altitude options to try to find smooth air and favorable winds.

I chose a turbo (w/Airmaster CS prop) because I fly out of 7200' in New Mexico. Summer DA's are in excess of 10k', so I get my money's worth from the turbo. If I were closer to sea level, I would lean toward a 912iS unless money really were no object. The best thing you can do is go fly Stick and Rudder's 912iS/Airmaster plane and their 914UL/Fixed-pitch plane in the same day. Unfortunately, they don't have a 914UL/Airmaster plane, but you'll be able to appreciate the entire decision space if you fly both of those airplanes.