Personally, I would do a T25 which is 72x30x18. I have T10s and T8s also but unless you want to upgrade in a few years, might as well just start large now lol. Here is a pic of the T25s. And to give you a size comparison, they boa on the bottom is Rosey who is 6.5' long and you can see she doubles the width and her body stretches back and bends at the edge of the hide. So she has plenty of room in there to stretch out. And on the top, you can Caesar crammed into his hide sleeping lol.
And here are the T10s and T8s. The T8s are on top. And then I got another mini stack of T10s and T8s but this should give you a size idea between them.
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