The ceiling is 9'. Would that allow a higher bed?

What exactly do you mean by a higher bed? I would choose a standard height bed(frame), not a bed low to the ground if that is what you mean.

when you say higher, you don't mean something w/tall posts, do you? if it just sits higher off the floor, I think you'll be fine.

The type of bed, IMO, is less of an issue than the other pieces of furniture you plan to put in there. In other words, for a room that small, keep the extraneous furniture to a minimum, e.g. dressers or chairs. Get your closets tricked out with organizers so you don't have to have a big dresser in there. Or, if you need more storage, think about getting a captain's bed--a platform bed with drawers underneath. I wouldn't go any larger than a queen-sized bed so you have room for nightstands.

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Sabrina gave you the best option. that bed she posted would be a perfect choice. it still sits off the floor, but works well in a small room, and has extra storage.

when you say higher, you don't mean something w/tall posts, do you? if it just sits higher off the floor, I think you'll be fine.

No not posts. The top of the mattress would be about 30" off the floor. I am not having any furniture or maybe just a small dresser. I am thinking to put a ledge behind the bed in place of night stands.