X2 on Jeff's comment, it was the first thing I thought of when I started reading your post. But sounds like you have it covered.
I run Leopard 4082 1600kv motors in one Spartan and in my Fightercat Cat, it has proven to be a strong reliable motor and I have turned props as large as X642 without problem on a T180 ESC.
The 4092 is going to give you more power to turn larger props, but,
keep in mind the larger motor will draw more amps, as will higher KV ratings, as will larger props. Your ESC will handle the AMPS, but as you have suggested, what about the batteries and wiring.
Look at the Leopard Hobby website and check the info on the motors.
The 4092 1730kv motor is 4200W, max AMPS 140, and Max Volts 23. On 6S you are pushing that motor to the max on volts. The 4082 1600 is 3500W, Max AMPS 120, and Max volts 33, well within the comfort zone for all components on a 6S setup.
http://www.leopardhobby.com/enindex.asp
For overall reliability I would suggest staying with the 4082 1600 and running a larger prop for speed. The downside is larger props create more prop torque to deal with.
For all out speed, look to the 4082 2000kv running a bit smaller prop. But again this motor is only rated 25V max voltage so you are maxing out again.
Also keep in mind the plastic hull, it has limitations on how fast you can push it before it shakes apart.
Kevin
PS Note the wind type on the motor you choose (Y or D) D wind motors require you run at low timing advance.
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