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8pot calipers are generally not any bigger than a 6pot, the pistons are smaller, but the surface area is generally consistent, I say generally because every manufacturer may vary slightly. It gives better progressive feel although there are many factors in a braking system that have to be considered, main being pads. Even the stock calipers with the right pad can feel great it depends on your style of driving.
On track I like hard and fast, which is not ideal for the street especially traffic, but it depends on you the driver.
Go with what is best for your budget and ease of installation with a company that will back its product if there are any issues.
As for wheels I run 18" but my stock z4m wheels do not fit anymore.
Good luck!
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