I have had the EC-7 wheels (option 2) for 4 years now and love them. I have also been running the 285's PSS in the rear and only rolled my fenders since I had slight rubbing under load. The 275's should be fine, but remember that Ryan will stay on the conservative side.
This show how the following looks:
http://www.e90post.com/forums/showthread.php?t=1249671
Option 2 pictured with taller profile
Front: 18x9" ET31 profile 2 face - 245/40-18 - and now 245/35-18
Rear: 18x10" ET43 profile 2 face - 285/35-18 - and now 285/30-18