I understand ur strategy,ur option will be get the biggest cage if ur veiled cham is a male,once u get it ,u can either sell the small cage or save it for another baby later,then section off ur bigger cage if its too big for ur 2 to 3 month old veiled,once he gets bigger,then u can let him use the whole cage which on the adult male veiled 24x24x48 is suitable,or u can do it like buying a car,start with ur own budget,upgrade when u need n sell the old one comes in the new n better equipped,the choice is for u to decide,these are just my suggestion to u.