Toyo RA-1 Sizing Question

[BudmanV24]

I just scored a good deal on (4) 255/40-17 Toyo RA-1's and was wondering what people are running up front with these tires? Suspension is stock Boxster S suspension. I'm currently running 225/45-17 & 255/40-17 Dunlop Z1's and that setup works pretty well. So go back to 205's up front, buy another set of rear wheels and some spacers and mount 255's up front, or is there some other size or front tire I should consider to match with these?