I really like air-tites and buy them from jp's corner. I also buy SAFE coin trays from collectors-gallery.co.uk and put my air-tited coins on the trays. The trays are not too expensive if you buy two at time and use surface mail (about $32 each including postage to the US). For example, I put my 40-42 mm French ecus on the #6463 tray, which has 15 spaces of 63mm. It makes for a nice display of 15 French crowns and protects the coins securely. You can take them out of the trays and pass them around without worrying about grubby fingers touching the coins. And you can still open up the air-tite without too much effort to get a closer look at the coin or to examine the edge inscriptions, unlike slabs.
With ancients I don't put them in air-tites (many are too thick), but still use the stackable SAFE coin trays -- for example #6430, which has 50 spaces of 30mm for the roman imperial as and dupondius-sized coins. Everything is thus well protected, easy to see and stacks up nicely.