I think the best way to get the motors is to actually place your order and they reserve them when the next batch arrives as opposed to the email alert option.
Oops I think they recently changed their policy and they don't accept backorders like they did in the past. Disregard
I've used different motors which I don't know the exact Kv but it must be greater than 800 because it's so peppy, it turned my tri into a hot rod. I don't have much time with it to come to firm conclusions, but for sure it's a decent substitute. Check out post #138 for details: http://fpvlab.com/forums/showthread....ll=1#post16219