A lot of people recommended (to me) something along the lines of 1500kv 225w. Specifically, the 2217-06 1500kv from a place like Grayson Hobby
(that includes matching ESC) and a 8x4 prop. You can find something similar from your preferred vendor, just look for about 70g and 225w. A Swift II with FPV gear will go vertical until the battery dies.