I get that queston a lot and mostly it depends on the amount of space you have and what you want to spend. The regular cb-70 is the most popular and the tray size is 33 x 17 x 5.25. That is the regular semi-clear tray and the complete is 10 levels and 30 trays. The other popular option is the cb70-8. That one is 7 levels and 21 trays. The trays are 8.5 inches high instead of the 5.25 of the cb70, which is handy for those " MONSTER" females. The tray is also made of ABS and a removable clear insert on the front for a much more durable and expensive box. The other option that most people don't know about, but a good route is the newer cf-750 which gives you a tray that is 28.5 x 17.5 x 9. It is a semi-clear tray and it is a good way to go for those who want the extra height and don't want to spend the extra for the ABS trays.I should note, that all of these can be bought as a level or a complete rack, that can be confusing. I am working hard to get all of this information up on the new website we are just fixing a few programming issues at the moment. Hope that helps. Jesse Freedom Breeder
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