Offset Emergency?

[shredzor]

I need to order my wheels, im gettin 22x9.5 AR cartels, and i can get the offset at 18 or 30. id like my wheels to sit flush with the wheel wells, or maybe even stick out just a little bit. what would be the best fit for me?
thanks guys

i have a 2006 ford explorer xlt

 

[sjr033]

what is the back spacing on the rims?

 

[shredzor]

Backside Spacing (in/mm): 6.5/165