xp and turbos can be made to work. From what ive been told and talking to a few guys with turbo setups, a VS is a better choice(over xp only). the durations seem to be differ on blower cams, IIRC the diff was it being to much duration on one side i belive it was the exhasut side.
feel free to chime in, im basicly just passing along info ive gathered.
Depending on how far you take the car that cam will end up holding you back some
cams are a major install, and you never get the money back, id say just leave it untill you want to do the full change over....
Stattma has a nice selection, and cartuning will have theres out at some point