The M car will blow the 30i straight out of the water when it comes to performance. I haven't driven a Z4 M, but I'm assuming it could probably lap the 30i :P It is, however, WAY uglier. Now, if you want an M coupe, then I say hell yes! But the best thing about the 30i will be the availability of CPO cars that are still under warranty. Also, you can't beat the fact that it's a coupe and a convertible! Sadly, there's not much of a market for aftermarket mods for the E89. You can tune a 35i, can't really tune a 30i. If I were you, I would wait for a decent 35i. The only thing that turns me off about the M roadster is how damn ugly it is):
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