Since you are saying rack, I'm assuming you're looking at using plastic tubs. What I've done since I like a lighter rack than what most people use, is to get a wire shelving rack that's adjustable. I buy the boxes I wish to use first, then find a rack that fits the size I'm looking for shelf-wise. A few strips of flex-watt wired up and laid on the back of the rack, and they are good to go. I do use containers with snug lids though since I don't trust a snake not to push a drawer style out. If they have to get the lid off and push the box out, I feel better.
This is the rack I use for my adults' setup which is using 40 gallon tanks (also houses my beardie). However, the shelf size also works for the 41 qt. plastic boxes. I got it on sale at Menards for about $35. Just have to watch the sales but they are common in spring. You could also use the plastic shelving racks.
http://www.amazon.com/Whitmor-6070-...DTYG/ref=sr_1_1?ie=UTF8&qid=1327848340&sr=8-1
I use 2 of these stacked (the metal ones screw together so you can make your racks as tall as you like) for my hatchling racks. They fit 3 boxes on each shelf wonderfully.
http://www.amazon.com/Whitmor-Supre...P692/ref=sr_1_7?ie=UTF8&qid=1327848340&sr=8-7