Why not wait for the 4.0i twin turbo six cylinder engine that has been announced for the new 740i? It has more hp than the 3.5i. We don't know when or if it will get to the X5 any more than we know about the 3.5tt, but as long as we are wishing and hoping, let's get the latest version.

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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