I run the Bimmerworld forged wheels 18"x10" ET33 with 12 mm spacers upfront. Front wheels rub without spacers, but I could probably run with smaller spacers around 7-8mm. But since BW recommended 12mm spacers, that's what I ended up running.
I also run Michelin takeoffs, since they are by far the best bang for the buck. I get great performance out of them the first 2-3 heat cycles, after which they drop off. But since keeping cost down is important and I still get good performance out of them even after 12-15 heat cycles, I'll end up running them for at least two weekends.
Here are a few pics and a video from Summit Point from this fall.