While using the JavaScript Next syntax, my code completion would no longer work for any angular objects beginning with '$'. (example: $httpBackend)
I finally deduced the issue to the fact that JavaScript Next syntax was set instead of JavaScript. If I change back to just JavaScript they work fine. I added an entry to my Sublime user settings for "word_separators" and removed the '$' from the list of separators. Doing this allows me to still use the JavaScript Next syntax and the code completions are working again for items beginning with '$'