I have done them all and I must say 100% stock ports, make the best power band for a street car, have the broadest power range, and with a turbocharger fitted any power loss compared to a mega ported engine is not ever important as it can be made up with only a couple of PSI difference in boost pressures............. and you give up nothing else, in fact you end up with a far better street motor (read more tolerable to back pressure, wider power band, more economical, faster acceleration, faster on track, and perfect match for stock 5 speed box).
Moral is don't waste your time porting your engine unless its an all out race car with 6 speed dog box attached.
