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Paul-
We seem to be on the same track, although I'm a bit ahead of you, time-wise. I switched to a AirResearch TS04 turbo, but I'm not sure you would need something that big, since it would depend on what sort of horsepower the rest of your car was set-up for. I'm not sure what the relationship is between Garrett and AirResearch, although there is one. My wrench suggested that AirResearch turbos were built to slightly better specs, and they were a bit more money. Also, after much deliberation I decided not to go with a ball-bearing version of the turbo, the "modern" technology, because the AirResearch guy said that they hadn't been able to demonstrate benefits (like longer life, faster spool-up, etc.) on my application with a ball-bearing turbo.
As for an intercooler, I put on a 1100 cubic incher from Motorsport Design in Scottsdale, which is the absolute biggest that could fit on my car with the stock rear deck. I'm not sure you could go that big either, since I have a Carerra intake manifold and associated stuff, which allows for a little more room for an intercooler. Still, you could easily fit a 800 cubic incher there. A bigger intercooler, as others have pointed out, only makes sense if: you're making a LOT of power and using it and/or you track the car a lot.
The stock 930 wastegate is a good one. Rather than upgrade it, if you want to do anything you should put on an electronic valve controller from HKS or Greddy. Others on this board have had good experience with them, I think. (I have Motec engine management, with boost control, so I can't tell you about the valve controllers from personal experince on a Porsche).
Good luck. Fun stuff, isn't it?
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