I remember me and my girlfriend going to films like Inglourious Basterds, Kick-Ass, Scott Pilgrim vs The World, Harry Potter 7.1 and 7.2, The Hobbit and films like that. As far as I know we both enjoyed them a lot.
It's all personal preference though. Romantic comedies are considered the standard for dates, but there are plenty of girls (or couples) who prefer other films.
If you're fishing for ideas, just check what she's into first. If you have no idea whatsoever and need a quick recommendation, I think Silver Linings Playbook would be a safe bet. It has romantic comedy elements, but is still enjoyable even if you're not into that at all.