Eflite BL32 2150 kV - the Habu DF motor. 5S on a 6x5.5, or 6s on a smaller prop. I think I need the 6" diameter prop for this large a wing, but we'll see. Not a crazy amount of power, but plenty.
I have found that with the stingray with it's 43" span it can't get up to sped with a 5.5 prop (at least on a three cell). The only good speed I have seen with the HET 2W-23 was with a 6X5.5 with the three cell on the maiden flight. I have tried it with everything from a 5X5.5 to a 5.25X6.25 on a three cell and even spinning at 27- 28K rpm best speed was about 130 mph.