I think any of them are fine. Personally I find Hammerstrike to be a bit expensive to run since they bumped up costs on Javelin Prosecutors and the Battalion itself, but it's still very strong.

The new box comes with points for Neave and has a Battalion for all the units inside, which is pretty good. If you want to expand, I would recommend checking out some more Vanguard units, but what you have is pretty good for the time being!