You'll save money by going with a 17x7.5 or 8 instead of 8.5. Going to 8 can require rolling and anything over almost always does. Personally, I think 17 is the perfect wheel size. Width is same, weight is less, and ride quality is less harsh.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>