Well do you want all blue or all green, or do you want a rainbow?
If you want all blue/ green get a nosey be.
If you want reds and yellows, and what not, get an ambi.
Exactly what I was gonna say! But look at it like this, if you're like most of us Cham owners then one is never enough! You'll probably end up with another one later on down the road so get which ever one you want more first and go from there.
Also there is tons a amazing breeders on this site with pure bloodlines and some great breeders that sponcer this site that have amazing bloodlines with pictures of the exact Cham for sale and the chams sire.