schulze 18.97kwf, 5s lipo, what motor

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The Neu motors are more efficient than the feigao/wanderer/nemesis motors. Since you've got a controller that is capable or running a Neu i would jump that opportunity.

The ebay idea is neat too, you can always decide what to do. If you depend on a setup, and can't have a thermal shutdown (in races) get a neu.

For a 5S setup i would take a 10XL, and if you need speed, get a 9XL and GOOD lipo's. (batteries are usually the limiting factor for the power a setup can deliver.)