STRUT TOWER BRACE?

I had the 08 without one and was really wanting one. This 2011 that I got does not have one. Dealer told me that I had to have 19's in order have this.
I laughed and they said with 19 it is harder 2 steer and you needed more
stability with the wider tires.
Since buying it I asked 4 it and they told me "everyting or anything
is @ dealer cost! So I wanted a strut tower brace and etc;
So here I am waiting they said $100 4 it but what about it ,is this my price?
In a nut, My car has no strut tower brace, I know every stiffing of the
chassis will make it better.
What does the census say??

I Am thinking, 2011 that I have, could improve with a strut tower brace?
The car is allready awesome compared to the 2008!!!!