M performance sounds good middle ground, I'm sure my wife will not tolerate M5 competition stiffness, had I have more open road I have no problem puffing more to get M550 instead my 540 (as M5 was out the question, not financial reason just wife think it's too hard of a car) think same thinking apply to M340 vs full blown M3 for a lot people (and 4 door is probably a big plus too)
Now if lower range of Alpina is available then that would have been a different story...
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