When it comes to "twincharged" cars, you have to remember that the motor only knows there is a blower on there for the times the turbo is not spinning.. The correct term for "twincharged" would be more like "supercharged, then turbocharged", as it would never make boost with both the blower and turbo at the same time.
Anyway, that being said you will be in turbo boost for 95-98% of the time you are making horsepower, so a turbo cam is the only thing you would ever need, and a ST5 turbo cam is the only turbo cam you would want to have. If for some reason you still want a ST2, ill sell you mine and Ill upgrade to a ST5.