Need wheel help

[MadMaxx]

Hey guys I need some help please. I'm ordering some C-5 grey wheels from "COYS" Wheels. they look pretty cool...a different look.
Anyways, I'm running 17X8 with 4.5 b.s. up front and either 18X8 4.5 b.s. in rear OR 18X9.5 with 5.5b.s. I'm running a factory 12 bolt. I just painted the car and am putting it back together. Do I take a chance on the 18X9.5? Will they or will they not rub? Some people say yes ....some say no..... I did nothing with the wheel lips.I also have the DSE coil over up front and the DSE 3" drop leafs in rear. What size tires?I tell ya it seems like one step forward 10 miles back

Any help or advice would be AWESOME!
I'll post some pics when I figure out how to do it.
Thanks
Jake