anywho if i were buyin brakes for my car i personally would go with the porshe 4 piston calipers up front with the hawk pads for the porshe and as far as rotors probably brembo drilled... thats all for the front.. thats about the best setup ull get. but its also a pricey 2500-3000 for the whole setup.
u need 2 sets.. http://www.ecstuning.com/Volkswagen-Golf_IV--1.8T/Braking/ECS_Stage_2/ES507/
First off, nobody needs 4 piston calibers in the rear as it does barely any braking at all, second off, porsche conversions are a lot of money and I doubt he's looking for that much stopping power, and lastly, cross drilled rotors barely help at all. They were only useful back in the day when brake pads built up gas and it would float the pad on the rotor, new pads don't release gases like the old ones do and all cross drilled rotors do for you anymore is make the rotor more susceptible to cracking. Slotted and vented is the way to go because it cools the rotor better and it bites on the pads better
ehh to each their own ... ive ran slotted.. ive ran drilled ... ive also ran slotted and drilled. in my opinion the slotted rotors stop better but the drilled rotors dont retain as much heat than with a slotted rotor. i only know this caz i used to autocross my b18 honda civic. with the slotted my brakes were heating up to quickly and would glaze the rotor.
but i agree 100% that slotted does make u stop quicker. i just really like the look of the drilled rotors for some reason.
but back on to the original topic if your looking for good rotors all the ones u have listed above are good choices. right now im running zimmerman rotors with hawk pads and its plenty of stopping power for my nearly stock 1.8.
so, today i go for for the clutch change ...and after when i will have the money...it will be tt/s 312 OEM brake dimensions, discs and calipers in front, and golf 4 OEM on back side! it is not an 300hp car, and my budget it is not for Boxter/Carrera.
i think, after few advices that it will be enough to feel a big diference
thank you anyway.
ps: this car cost me 7500 dollars, it is realy impossibile to pay 3000 for the brakes, thank you anyway