tire size question!

[MainEvent212]

I'm buying new tires tonight and i've hit a speedbump if you will...i'm making about 230 WHP and plan on getting more out of my car...i'm buying rear tires now...

my wheels are 17x8 and offset can be changed cuz i have adjustable spacers

the front tires are kumho ecsta supra 712225/45/17

the questions are...1. what kind of tire? i say probably kumho ecsta supra 712 just to match, but i think the kumho ecsta MX would make a nice rear tire as well...

2. what size? im debating between three sizes

A> 245/45/17-i say this because the G35's tire setup is this way...225/45 fronts and 245/45 rears

B> 245/40/17-this will keep the rear tires shorter in sidewall...i dont think it's a big deal personally...i calculated and the sidewalls will be 11cm w/ the 45 and 98 w/ the 40

C> 255/40/17-reasoning? uh duh? lol but will it fit

help plz! kthx

i know this should be ni the tire and suspension forum, and in fact it is! but i'm getting no views...let alone answers...i need answers!