I just found some really nice ENKEI wheels that are available in 17 and 18 inch sizes for the NC. they are avaliable in gold with polished lip and are kinda spokey like stock NC wheels. its a brand new wheel so probably wont be in the online catalogues..ill ring my local tyre place and ask them what it is.... HERE THEY ARE ENKEI RS7 http://www.magwarehouse.com/index.cfm?l ... our=Bronze
DONT WORRY ABOUT THE FITMENT NOT INCLUDING THE NC......THEY ARE NOW AVAILABLE IN SIZE/OFFSET FOR THE NC.
If you can find the latest copy of HyperRev that features the MX5, there is a whole section that features Wheel/Rim combos for the NC (about 10 pages worth I think)...
I would scan these pages for you but I dont have a scanner