Brushless E-maxx Suggestions

I am looking into getting a brushless motor and controller for my E-Maxx I am looking for some suggestions on what to get. I would like to get something that would give me a significant speed increase, but not suffer a huge loss in runtime. I would be running it on 14 cells initially, and would eventually like to run Lipo's sometime down the line. My truck is running on original size proline tires. I also currently use a robinson spur kit 66t, I believe. Any feedback would be appreciated.