Those are just the few that Ollivander works with. There are more exotic cores, such as Veela hair, that he doesn't use. I think I'd prefer something like that, something different.
Unless I'm mistaken, time in Azkaban is the sentence for being an unregistered animagus. That's where she'd end up for awhile if Hermione had turned her in, and if the Ministry didn't decide to ignore it, of course.
It was public knowledge that Sirius escaped from Azkaban. Peter knew that Sirius would come looking for him and he knew that he was well acquainted with his animagus form. So being the coward that he was, he ran and hid.
That just sounds like lazy writing, to be honest.
I've always looked at Harry/Hermione as the better pairing. Ginny basically starts out as a Harry Potter fangirl then turns into a boy hopping THOT, while Ron and Hermione are so polar opposite that a romantic relationship could never realistically hold up.