Have you guys seen YapDatabase [1]? It is an awesome Obj-C key/value/collection store (and more) built on top of SQLite, that I originally started using instead of Core Data for its easy SQLCipher support. It's built by the venerable Robbie Hanson [2] who is well known for his previous work: CocoaAsyncSocket, XMPPFramework, CocoaLumberjack, and CocoaHTTPServer.
If you're tired of Core Data, I highly recommend reading the wiki [3] and giving it a shot!
I have a friend who uses it in production. He swears by and has tried to convert me. I'm still sticking to CoreData with some categories for syntax sugar, but I've been closely monitoring realm.io for the last couple of days...