I'm a longtime Jetbrains fan (ReSharper and TeamCity).

I looked into AppCode a bit earlier when it was still rough. Getting tight integration is the key for me. Refactorings would be nice (XCode has Rename already), but really what I want are snippets, or something to take some of the drudge code away.

For instance, to add a property I have to add 4 lines of code in 4 different places. This should be one action (which can be overrided later).

Also, code navigation. This was terrible in XCode 3, better in 4, but nowhere near ReSharper or IntelliJ.