Ive been looking at animalplastics.com and i think thats where were going to get our rack from. my question is, would i be better off getting the iris bin rack, the sterilite bin rack, should i get back heat or belly heat? I know for a fact we will have at least three balls, should i get a six bin rack or seven, huge difference in price for one extra bin (i want room to expand of course)? at least that would give me a limit lol