We had this discussion on another thread, but in case you didn't see it, I would advise against the prop Ultimate 3D suggests. You can buy it and try it, but in spite of the energy savings, I didn't like the way the Slow Stick flew with it and I have light components, except for the battery.

For me, the 1147 lacked authority. You can fly slow with the 1180 by going 1/2 throttle and punch it if you need the gas, er, electrons.

The 1180 is a good prop. The 1260 was nice too, but I got less time per flight with it.