Brushless Savage Help

Thanx for the advice, squeeforever.

What kind of run-times do these motors provide?

Will there really be a signigicant run-time difference between a 8XL, 9XL, and 10XL?

I'm a bit confused my the rating on some of these motors. Everyone says that these XL motors are significantly faster and more powerfull then the Novak HV-Maxx set-up, yet the Novak motor seems to be rated at almost twice the rpm/volt speed.

HV-Maxx: 4400 rpm/volt
Wanderer 8XL: 1875 rpm/volt
Wanderer 9XL: 1667 rpm/volt
Wanderer 10XL: 1502 rpm/volt

Since I'm not looking at running an insane 18+ cells or 4s-6s li-po set-up, will I actually see a drop in speed?