Thanks kd6lor,
When I test drove on of the F10's, it had black ventilated seats. They did feel comfortable.
I have the grey leather on my 3-series E46 and it stays pretty cool, especially when I cracked the window slightly. I'll look into the vented seats - parking black cars under trees for shade just attracts bird poop. The vented seat package comes with some overlap (heated & multi-contour) that other packages offer as well, so not economical in this sense.
Edit: Pricelist shows the vented seats package $1000 cheaper when you have Sport package, so you don't pay for multi-contour seats twice. And Premium package drops $400 with vented seats so you don't pay twice for heated seats.
-Magic