this thread is funny.. seriously - if the guy wants to spend money on an intercooler - he is allowed isn't he? People spend $3000 on rims for their car, and yet the engine stays stock but that's their business what they've chosen to spend the money on for their car.
Anyhow Pressa, you're best off with both a good intercooler AND a full aftermarket ecu to run your upgraded turbo..
SAFC might work on a larger turbo but you'd really be limiting what you can do with your car for a while, or even the power you are putting. Ultimately you're putting on a larger turbo for more power correct? why limit that? best to wait until you have a little more cash and do it all properly at once. You will save money there too.. one tune, one trip to a garage to get everything fitted, etc.
Running a stock cooler with any larger turbo is probably NOT a good idea. It might work on the street, but do you really want to risk your engine or $1500 nicely highflowed turbo on a hot day or something?