Hook the Maven

Maven in Geist seems really good to me, as the other breakers you'll be running let you power it up easily, and then lets you break ICE without losing your board state.

Some other choices

Maxwell James is mainly used for getting the link to run the cloud suite, but if you have a sports hopper installed, you can use the ability for a good surprise Dean lister to boost an Maven when you aren't at full strength yet is great Spy Camera adds R&D pressure, The Gauntlet HQ pressure Trope gives the deck recursion, and helps boost Maven, due to Maven you need less recursion than most Geist decks, so not Levy is useually ok Grappling Hook is great with Maven, making it potentially break any ICE for 2, but with some tech traders, often its break any ICE for free ! It's a lifesaver against Brainstorms and Tour Guides etc.

Bad Match ups It doesn't really like PU, or Skorpius. But I have won games with it against both, as the Mavens make it less concerned about losing a couple of the B&E breakers