the 4 pot calipers makes a huge difference, not just in braking capabilities but to which wheels you can buy too, reason for this is that the clearances and offset have to be right to get the wheels to clear the calipers, if you were to have 4 pots on a pintara or bluebird and were to try and put an everyday set of wheels on, say 16x7 inch wheels, then the likelyhood that they will clear is low. ask SSS how much trouble he had getting a set of wheels in 4 stud to clear the calipers.
now try to do this with five stud wheel options and you have many more choices as most new 5 stud wheels from japan are made for big brakes and will clear them no problem. this way you dont have the hassle of having to test fit multiple wheel combinations before you end up with the wheel to fit......
i know why i am going 5 stud..... i dont think that it would be an easier decision to say to do it