Six please.
I do love a throttle bodied Four as a little rorty monster but the Aero chassis would benefit from the smooth sound of a six. I think that like the auto box it offers a more "smooth" experience which befits the retro-modern thing going on with an Aero.
I would still worry about the huge slug of turbo torque that they seem to design and program in now a days (too make it feel like a turbo deisel perhaps !) and how that would effect the traction and driving style of the car. We might find a few more in ditches if we are not careful.
