What are you buying the ski for, powder/all mountain or park as well?
If it's mostly powder/all mountain then my adviuce would be to get the S7s asap. I have never had so much fun on a ski in all my life -they rip amazingly well in all conditions in spite of their size. I'm 5" 6/160 lbs and ski the 188s. They're a good chunk over my head which offers plenty of stability on drops and at speed but are still so nimble and quick to turn it's unreal. Don't be afraid to go big if you're going to be skiing aggressively.