Brushless Motor Advice

[Twiglet]

Hi, I would like to change the current motor in my cougar for something with a little more speed. I am currently running a Novak 10.5t sensored motor. What are the specs I should look at when comparing motors as I see that not all say 6.5t brushless motors have the samer KV rating, should I be converting this to watts? I am thinking of a 6.5t motor, will be used on astro and carpet. Any help/advice much appreciated.
Thanks
Mark