As was said previously, more information is needed on both what you are looking for and what these horses qualifications are to determine suitability. The new one looks green and will require a lot of training before I would consider him for someone looking for a horse to learn on (is he even broke?). The previous three I don't like any of them for a "teacher", because none of them are shown in the pictures doing anything. #2 is the closest to a riding picture and it looks barely ridable in it.
If these are the "best" pictures of the horses the sellers have.... I'd be walking right past all the horses in this thread.