For an adult I would set the tank up vertically. For younger geckos you could start out with it horizontally, and I would actually recommend keeping it horizontal for smaller geckos (under 10 grams or so). My number one recommendation for an adult would be something somewhat larger than a 10 gallon, but for the average size adult I think a 10 gallon is the minimum (or something like an Exo-terra 12x12x18 enclosure, which is a very similar size to a vertical 10 gallon). The more perches, branches and vertical climbing space you provide, the lesser the chances of your gecko hanging out on the glass (and they love to hang face down for some reason, which puts all the weight of their tail on that one vertebrae at the base of their spine), so the lesser the chance of FTS.
BUT, here is what I really think you should plan on. You won't be able to get just one crestie. It's just not possible. SO, plan on getting an 18x18x24 Exo-terra or some sort of screen or partial screen enclosure of similar size. Use your 10 gallons to grow up the babies/juvies that you get (or you can start babies in kritter keepers and move them up to the 10 gallons when they are ready). Then when they are old enough and sexable you can move your females into the larger enclosure, and if you don't have other larger caging by then as well you can keep single males in the 10 gallons until you upgrade them to make room for more babies.
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