Kinda depends on what you want to spend. You won't find one as cheap as you can build it yourself. There's ARS and freedom breeder which are the high end of the spectrum, and the lower cost pvc ones like AP and C-serpents. I can't honestly recommend one over another as I have to build mine to cut costs, but if inwas buying it would be AP because I really like the look and build of their racks, or ARS if I had a climate controlled room. And because they're close enough to make the drive to pick up and avoid freight cost.