xbdetailguy, The two best tires in terms of ratios for speedo / odo are 225/40 and 215/40. 225/40 is more common so if you were in need of an emergency spare that would be the best size. Anyway, that's the size I went with I think it looks decent:
tires could be just a little beefier, but then it would effect the ODO and speedo ratings.
P.S. I think a really awesome width is to get staggered by 1 inch. 18x8 and 18x9 looks really good, as well as 18x7.5 front and 18x8.5 rears. If you notice, my car has narrower rear wheels. Can't stand that - so I bought spacers.