I'm looking to get a crestie and I can get a good deal on a 36 gallon tank, I know they need taller more than wide but seems to be fairly good in size!
I agree with Silas. That would be great if you made it into a vert enclosure, which shouldn't be to hard to do. Crested Geckos would LOVE the extra height. Another question: How big is the crestie you're considering (weight-wise/grams)? That can have a lot to do with the size of the cage as well. However, if you can get the tank in your pic for a good deal, I say go for it. If the crestie is small, you can always move it over when it gets bigger. Just a thought.