S vs regular Boxster (2005)

[gary]

I am close to purchasing a regular boxster (2.7). My wife is behind me but has said she is concerned about the noise (we did a two hour test drive) and has said she may not want to go more than an hour at once. I was wondering if the "S" would be any quieter since I would not have to rev as high before changing gears due to the increased HP and torque, since under normal driving conditions I do not drive agresively. Does this seem logical or am I off base.
Also are there any other differences between the two models other than engine and a 6 speed.