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For me personally i would go with the 135i. I am in the same boat.. sorta, want to DD it, yet build an awesome fast car. The aftermarket availability is there for more power gains via the n54/n55, however the reason i would choose the 135i is because its going to be as close to the Z3 in terms of driving and nimble-ness (if that's even a word lol) yet being able to daily drive it and build it for more power easily. By all means if you have the time and money to mod the Z3 for more power down the line then go for it, but IMO the 135i seems to be the most efficient way to get what you want out of the car. plus im sure with what you save in the cost of the Z3 you could put that into supporting mods for handeling into the 135i. .. Again my personal take on it.
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