check out www.radiocontrolzone.com
for some good brushless info
Hacker is only one of many brushless choices, and right now they aren't that great.... the motors cost more than most others and their esc is currently discontinued.
Shulze 18.61K or 18.97K or U-Force
Lehner Basic or 1920 series
Kontronic Twist series
Hacker B40 or C40 or B50
there is a bunch of motors....