Wheel Spec Help

[CRG77]

Hi Everyone,

I am hoping some of you may be able to help me with a couple of things in regards to wheels. I am looking at upgrading to some works or rays wheels but I am not sure what specs to go for without rubbing. 

I have a 2011 STI with stock suspension. Will an 18 x 9.5 et 38 fit my car without rubbing? Or should I for an 18 x 8.5 with 45 or 38 offset? 

I want the wheels to sit flush with the body instead of being tucked in. Any help would be appreciated :)