Twin Force Brushless Questions

Thanks for the help! Didn't expect to see 6 replies so fast!

squeeforever recommended a lehner motor for better runtimes, why is this? How much more of a runtime could I expect? I dont mind spending a little extra if it's worth it?

Ok, most of you recommended the Warrior 9920 for the controller, I have also seen the Schulze 18.97 that is about $120 more but it looks like close to the same specs, is it better than the Warrior?

I have seen the IBC 3800 and was interested in getting 6 cell unmatched packs, I couldn't find them on this site, do they sell them here?

Why do all of the Radios come with a servo? Do they sell them without the servo?

I dont understand all of those gear ratio #'s

:C: