Well, Tahoe, it looks like you weren't correct about the Arc/Linear/Aero thing (this information makes no reference to trim lines except for I6 or V8). The black one is a I6 model (as evidenced by the twin-spoke wheels; the black with 6-spoke are photochopped on). I must say this car is sharp! I'm not sure which of these colors looks better. I definitely like the satin trim look on the black model, but at the same time the smoked headlights and black grill give the silver a nice contrast. Either way, they both look good. I do hope they offer aluminum trim on the interior; that would make it perfect. And those 6-spoke wheels for the V8 definitely look good. I'll be interesting to see how it performs though, seeing as how they are pushing it as the "sporty" GMT360. I wouldn't expect it to perform on par with, say an X5, but if it can keep up with some of the car-based models, I'd say they have a winner.