As far as racks that can hold all 3 sizes of tubs it will either be ARS http://www.arscaging.com/welcome.html or Freedom Breeder http://freedombreeder.com/

You also have http://www.animalplastics.com/ with some racks that accommodate juvies and adult males or females around 1500 grams.

And last option is to build your own.

Depending on how fast your collection is growing you might plan on using several racks one that can accommodate hatchlings one for juvies and one for adults.

I use animal plastics and I only use 2 sizes hatchlings and adults.