If you go with a 40 sized Ultra Stick, it's hard to beat an OS .55 AX with an 11 x 6 APC prop. Hovers at half throttle with power to pull right out. A good four stroke is the Saito .82 with a 13 x 6 prop. Has about the same power as the .55 AX but is twice the price.

I purchased a Pulse XT several months ago, new in the box. Before I got to build it, I trained a student to fly on the buddy box with his Pulse XT. It was extremely stable and fine for loops and rolls, but does not compare to the Ultra Stick in hovering, inverted flight, and flat spins. I sold the Pulse XT shortly after that still new in the box and still fly my Ultra Stick weekly, as I have for the past two years.