Either in 19s or 20s? Doing some research for a friend of mine.

19X8.5
19X9
19X9.5? (I didnt think this would fit)

20X8.5
20X9
20X9.5

Offsets?

You wanna be a guinea pig...I know you are really conservative with this kinda stuff. :)

since the cars can take drastically different sizes

I am helping someone with finding out what S4/S5/RS4 owners want in a forged wheel.

you should have asked more detail like what we want for weight, cost, ect also

probably in the $550-700/wheel range...forged...19-20lbs...

19 X 9.5" Dymag carbon fiber and magnesium.

they will powdercoat spokes to a bunch or different colours. lighter han anything else out there. about 2400 per rim. rims weigh 14 - 17 lbs. per corner.