I like Tree Designs (http://www.treedesigns.com). I have a 750-cap. one in black oak that is very well built. The larger ones are built w/ kit-type cam locks, but the panels are still very good quality. The shelf assemblies are supported by pins in the side panels- the added bonus was that I needed to move the whole rack across the room and this made pulling each shelf + contents out without removing the discs. They're definitely a good deal for the money.
