I just added my suggestion [only] that any potential jail breakers install a full version of an iOS, not the OTA version. It has made a difference in the past and there is no harm in continuing that practice.
Not that I have anything concrete, you understand. It's just that, after the issues the jail break community had in iOS 5 with factory and iOS firmware not working with the re-restore process that was released, I have always used iTunes and DFU mode to upgrade.
But that's me and I may be a "nervous Nellie." YMMV.
Still, it's okay to go to iOS 7.0.3, regardless of how you get there.
Hope this clarifies and sorry for any confusion.