S63 Wheels
If you opt for 21" ride quality will suffer a bit and the chance of getting a bent wheel will increase, but there is still a decent amount of sidewall and a strong forged wheels should hold up okay if you keep the tires well inflated and avoid the largest potholes. Handling will improve a bit with the lower profile tires too. Tire choices are more limited in 21" but I think Michelin PSS are available and they are the ones you'd want anyway.
Aftermarket wheels also can be purchased wider than OEM so accomodate fatter tires.
All that said, the 10-spoke forged 20" wheels are nice and might save you headaches and will be cheaper. I'm planning on getting the black ones for mine and not replacing them.
In response to your concerns about 21's, yes a 21" wheel will yield a slightly stiffer ride than the 20's due to the lower profile tires but the differences would be minuscule. if you don't want to compromise ride comfort at all then we can still set you up with 20" wheels that will more than pop - they'll completely transform the look of your car. HRE & Adv.1 will be the top options hands down
HRE S204's

ADV15R Track Spec CS

I think I'm sold! Keep in touch please, lmk if there's anything you need.
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