Are you happy with the FSA crank? I've got the FSA SL-K carbon crank with the Mega Exo BB on the tandem, and I am not sure about how durable they have been, but it may be due to the loads they are seeing. At least chain rings are cheaper than Shimano.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue