Wait Jailbreak 6.1.3 or 7.1?
Updated. One more step to jailbreak 7.1, 7.0.3, 7.0.2. We have good news for jailbreakers. iPad Mini 2 and iPad Air has been released. Wait and released.
If you've already lost the JB by upgrading to 7.x, then yep it's fine to go from 7.0.x to 7.0.3.
Don't forget: jailbreak 7.0.3 not released, but fake developer’s promises spreads on the web. We'd recommend reporting such faker for spam. He does not have a jailbreak and is only taking donations for his own benefit.