rack!

well this weekend i would like to order my first rack, im thinking about getting this one http://reptilebasics.com/Iris-Sweate...t-p-16197.html ...now i have a few questions, im told i can have two different sizes do i need to order the dividers for this or can i just do with out, and second whats best back or belly heat?

Actually i have the CB-70 Rack from Reptile Basics and i think it's just great. Especially for female BP's since they tend to get larger than males.

nice, but i would like one that holds roughly 15qt and 30qt