so, 16x8F and 16x9R or go with a larger diameter wheel?

[Signal 2]

Originally Posted by phoenix7

....I argue that by keeping stock diameters I don't have to modify anything for the speedo...braking will be better due to less rotational mass and the gearing will yield the best off-the-line/acceleration performance than 17" or 18" wheels (that are the same width/weight).

Sounds like you've made up your mind already, but one more argument for staying with 16s would be ride quality. Most cars (mine included) spend most of the time on the street. You can have thinner sidewalls to keep the speedometer close, but that 1" less in aspect ratio makes a difference. Especially if your running higher spring rates on coilovers.