I was playing a beautiful combo of Wilson NXT Tour and Luxilon Big Banger but the gut-like NXT broke quite often and although the feel was spectacular I was worried not only the strings would end up broke.
I decided to try out the more durable Babolat RPM Blast which promised a lot of spin and feel. From the first hit it felt wonderful. I got the spin and feel I wanted and it took me many, many sets of tennis for it to break.
The RPM Blast has become my permanent choice of string and it will take a lot for me to change.
If you want to know more about different kinds of strings read this excellent post