Personally both the blue and the GM look great. It depends on how much time you're gonna have to care for the exterior... If plenty, you could do blue, which looks great with black/CF mods. If possibly not, as said the GM would hide dirt better.
As for trans, I'd say if you've had the manual and you're comfortable with it in your location, stick with what you know. The MT is made for those who enjoy it and plan to push the car hard on a track. However the AT in the 370 is a
vastly improved AT over previous models. It handles quick high RPM shifts quite nicely, and still has that neck snapping torque you'd be used to from a manual.
Takeaway: that the 7AT vs the 6MT
stock v stock the 7AT will win.
Proven. (
Of course with an extremely skilled MT driver, things may change, but as it stands the AT shifts faster)