Personally I'd shell out a little more cash and go with an ARS system. The ARS-7010 is about $100 per level and the frame is made of steel instead of plastic. I've seen videos of big rack systems made of plastic, they may be cheap and light but if you lean against them the whole thing shakes and that scares the heck out of me LOL. The last thing you need is someone pulling over your rack system. I can literally climb up my ARS racks like a ladder, they are rock solid. Being that solid you can add levels and stack it up to the ceiling to save space. And the tubs are thicker, and I really like the built in cup holders. I use the Dixie cups and just swap out the cups and save the old cups and wash them out every six months or so, makes maintenance a lot easier. Plus if you ever sell it I would think the resale value would be higher.

http://arscaging.com/ars7010_hybrid.html