My head is spinning

I'm a retired Air Force mechanic getting back into flight Sims. Last Xplane I tried was version 7.

Long story short, my computer specs are:
Macbookpro 13 inch
I5 2700 processor
8gb RAM
Iris 6100 1.5mb graphics
250gb hard drive.

What version of Xplane could I actually run on this decent? Xplane 11 caught my eye but, I'm a realist. I'm eyeing version 9 with just North America.

Any push in the right direction towards what version and setting up a regional type corporate airline based out of Meigs field would help. I like small corporate style aircraft.