Chika, from what I've heard from breeders of gaiteds, you really don't usually want to do crosses...the result isn't often what you would expect, and can take quite a bit of smoothness out of the gait. Just my opinion and limited knowledge...could be wrong on that.
Also, crosses don't do as well on the market if you ever need to sell. LoL, not trying to be the voice of doom, just some things to think about. The economy is pretty awful right now, and the horse market isn't doing well, to say the least.