[Dafni]

Hmm, me too:D
Unfortunately I have no representative numbers at hand. Had a hard time finding the right gearing, and had some bad luck with motors. I hope my new Lehner will get some more sensible numbers.

But I can say that much:

On the brushed setup (Titans/EVX) you get good 15 minutes if you bash around in both gears. Even more if you stay in first a lot, less if you keep it in second gear. If you have full race conditions, you will hardli get 9 minutes.

On the 9L I got barely 10 minutes under full race conditions. But this is not reasonable, because I never managed to keep the motor in a save temp range.

(all on 14 cell GP3300mAh)

I agree with Serum, you can always start low, and buy better stuff later on. Basically the more efficient systems are also the more expensive ones.
I myself had a good time on the brushy setup, and at the moment I am thinking of making the V1.0 brushed again, when v2.0 is finished. Then I'll have a race ready truck, as well as a Backyard Basher;)