I can consistently push my 35" Prodigy wing to 110-115mph on a Don's Wicked 3000KV motor
, running 4S on a 4.75 x 4.75 prop. He recommends not propping above 4.1 x 4.1 on 4S, but my batteries (2S in series) are only 40C burst, so I think I'm okay going a bit larger.
I've also tried a variety of other motors (ARC, HET) with only a 5-10mph gain with my current batteries. For the money though, the Don's Wicked motor has been great.