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I suggest you wait until after a couple of track events before investing in extra wheels/tires. The car is more than capable as is, and, track schools might prove to be something you don't pursue on regular basis.
I have a set of the Apex wheels, 18X10, and use 275/35 all around. The E90 series M3 is noticeably more neutral than was the E46, and a square setup is thus not as important. It appeals to me both for the handling balance, and the ability to rotate between all corners. For that reason, I see no practical reason not to use a square setup, assuming you are going to buy extra wheels. The real fix of course, is for BMW to use a suspension setup that allows sufficient adjustability to yield the handling balance desired. The Apex wheel is relatively light, and plenty strong for your intended use, a good wheel.
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