the most popular DD by gws is the cn12-rxc or the edf50H which are actually the same motor, one is just for the ducted fan. Anyways the props you use on them are either like a 4530 or a 3020, but I don't know how much thrust the stock tail has on the axe to compare the two tails

here is a place where you can get the whole kit
http://www.eboyztoyz.com/index.php?op=showitem&sku=8350