Frankly, I would still suggest learning some more Objective-C. It's a very powerful language, and it is designed to allow you to many things that Apple considers necessities much more easily (eg. Animation, Persistance, Databases, MVC). Apple has designed their frameworks around Objective-C very tightly, and to really use them well, you have to use them from their language. Also, what other languages do you know? I, for one, found Objective-C much easier after coming from C/C++ and a scripting language (Ruby). It all really depends how much iOSness you want in your app. Even it Titanium can make the user end feel iOSy, iOSy code is actually really fun to write and maintain. It can be quite a beautiful framework.
