Until there is a "reasonable" SC kit on the market, then this question is moot. (OT: Anybody remember the Jessie Jackson skit on Saturday Night Live?)
Second of all, I really enjoy sitting back and reading about how laggy the turbo setups are for the RS. I've had quite a few people in my RS and never has anyone talked about my car lagging due to spool up. The car has plenty of power off-boost to get the car moving, and then the boost comes on and you're off. Not a violent-torque-steer-lose-traction boost like is evident on some turbo vehicles, but a nice application of power. And this is on my "huge" Garret T03/04.
Steve
http://www.lagging.com/