P128sniper

So I finally decided on which wheels I want to go with. They are the ssr gtv02 in the silver color. Only color choices are flat black or silver. I really want more of a gunmetal but I can probably paint them if I don't like the silver. So regarding sizes, would a 18x9 and 18x9.5 front and rear work with 235/40 front and 255/40 in rear lowered a little on coils without any issues? Also the offset choices for those sizes are +35 or +45 which one should I get? Please someone help I'm new to wheels and I've had the car for 3 years and I'm so tired of stock. Please help me decide which offset I need and what else I would need with the wheels. Hub rings? Hub on ssr gtv02 is 73 I think. Also I need lugs to match the color correct? Thank you in advance.